diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 0761beb..aab2256 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -19,13 +19,18 @@
 from .. import *
 
 title = "Vickers 7th Graders (1981)"
-description = """A small multiplex network of friendships among 29 seventh grade students in Victoria, Australia. Students nominated classmates for three different activities (who do you get on with in the class, who are your best friends, and who would you prefer to work with). Edge direction for each of these three types of edges indicates if node i nominated node j, and the edge weight gives the frequency of this nomination. Students 1-12 are boys and 13-29 are girls. The KONECT version of this network is the collapse of de Domenico's multiplex version.[^icon]
-[^icon]: Description obtained from the [ICON](https://icon.colorado.edu) project."""
+description = r"""A small multiplex network of social relations among the 29 students of a seventh-grade class in a school in Victoria, Australia, collected by M. Vickers. Students were asked to nominate their classmates on several relations, of which three form the layers of this network: who they get on with in the class (`get_on_with`), who their best friends in the class are (`best_friends`), and who they would prefer to work with (`work_with`). A directed edge $i \to j$ in a given layer means that student $i$ nominated student $j$ for that relation. The data were made available as a multiplex network by M. De Domenico.
+
+Nodes are numbered from 0 to 28 (corresponding to students 1 to 29 in the original data); students 1 to 12 are boys, and 13 to 29 are girls.
+
+The network has the following properties:
+
+- Edges: `layer`, the relation (1: get on with, 2: best friends, 3: work with; the names are stored in the graph property `layer_key`); `weight`, which is always 1 (the upstream data are unweighted)."""
 tags = ['Social', 'Offline', 'Multilayer', 'Unweighted', 'Metadata']
 url = 'https://manliodedomenico.com/data.php'
 citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=%22Representing+classroom+social+structure%22&btnG=')]
 icon_hash = '56cde232a6d70217090cdb87'
-ustream_license = ('Open Data Commons Open Database License (ODbL)', 'https://opendatacommons.org/licenses/odbl/')
+upstream_license = ('Open Data Commons Open Database License (ODbL)', 'https://opendatacommons.org/licenses/odbl/')
 upstream_prefix = 'https://manliodedomenico.com/data'
 files = [('Vickers-Chan-7thGraders_Multiplex_Social.zip', None, 'comunelab')]
 

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index dfb3a07..0761beb 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020-2024 Tiago de Paula Peixoto <tiago@skewed.de>
+# Copyright (C) 2020-2026 Tiago de Paula Peixoto <tiago@skewed.de>
 #
 # This program is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Affero General Public License as published by the Free

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 5aa2f31..dfb3a07 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020-2023 Tiago de Paula Peixoto <tiago@skewed.de>
+# Copyright (C) 2020-2024 Tiago de Paula Peixoto <tiago@skewed.de>
 #
 # This program is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Affero General Public License as published by the Free

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 4a1b433..5aa2f31 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2021 Tiago de Paula Peixoto <tiago@skewed.de>
+# Copyright (C) 2020-2023 Tiago de Paula Peixoto <tiago@skewed.de>
 #
 # This program is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Affero General Public License as published by the Free

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 6fb732f..4a1b433 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020 Tiago de Paula Peixoto <tiago@skewed.de>
+# Copyright (C) 2021 Tiago de Paula Peixoto <tiago@skewed.de>
 #
 # This program is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Affero General Public License as published by the Free

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 4386e5b..6fb732f 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -22,11 +22,11 @@ title = "Vickers 7th Graders (1981)"
 description = """A small multiplex network of friendships among 29 seventh grade students in Victoria, Australia. Students nominated classmates for three different activities (who do you get on with in the class, who are your best friends, and who would you prefer to work with). Edge direction for each of these three types of edges indicates if node i nominated node j, and the edge weight gives the frequency of this nomination. Students 1-12 are boys and 13-29 are girls. The KONECT version of this network is the collapse of de Domenico's multiplex version.[^icon]
 [^icon]: Description obtained from the [ICON](https://icon.colorado.edu) project."""
 tags = ['Social', 'Offline', 'Multilayer', 'Unweighted', 'Metadata']
-url = 'https://comunelab.fbk.eu/data.php'
+url = 'https://manliodedomenico.com/data.php'
 citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=%22Representing+classroom+social+structure%22&btnG=')]
 icon_hash = '56cde232a6d70217090cdb87'
 ustream_license = ('Open Data Commons Open Database License (ODbL)', 'https://opendatacommons.org/licenses/odbl/')
-upstream_prefix = 'https://comunelab.fbk.eu/data'
+upstream_prefix = 'https://manliodedomenico.com/data'
 files = [('Vickers-Chan-7thGraders_Multiplex_Social.zip', None, 'comunelab')]
 
 def fetch_upstream(force=False):

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index 5b0e058..4386e5b 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -23,7 +23,7 @@ description = """A small multiplex network of friendships among 29 seventh grade
 [^icon]: Description obtained from the [ICON](https://icon.colorado.edu) project."""
 tags = ['Social', 'Offline', 'Multilayer', 'Unweighted', 'Metadata']
 url = 'https://comunelab.fbk.eu/data.php'
-citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://www.google.com/search?q=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&oq=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&ie=UTF-8#q=%22Representing+Classroom+Social+Structure%22')]
+citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=%22Representing+classroom+social+structure%22&btnG=')]
 icon_hash = '56cde232a6d70217090cdb87'
 ustream_license = ('Open Data Commons Open Database License (ODbL)', 'https://opendatacommons.org/licenses/odbl/')
 upstream_prefix = 'https://comunelab.fbk.eu/data'

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index da36431..5b0e058 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -3,18 +3,18 @@
 #
 # Copyright (C) 2020 Tiago de Paula Peixoto <tiago@skewed.de>
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
 #
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Affero General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from .. import *
 

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
index ec1e7df..da36431 100644
--- a/entries/7th_graders/__init__.py
+++ b/entries/7th_graders/__init__.py
@@ -19,7 +19,8 @@
 from .. import *
 
 title = "Vickers 7th Graders (1981)"
-description = "A small multiplex network of friendships among 29 seventh grade students in Victoria, Australia. Students nominated classmates for three different activities (who do you get on with in the class, who are your best friends, and who would you prefer to work with). Edge direction for each of these three types of edges indicates if node i nominated node j, and the edge weight gives the frequency of this nomination. Students 1-12 are boys and 13-29 are girls. The KONECT version of this network is the collapse of de Domenico's multiplex version."
+description = """A small multiplex network of friendships among 29 seventh grade students in Victoria, Australia. Students nominated classmates for three different activities (who do you get on with in the class, who are your best friends, and who would you prefer to work with). Edge direction for each of these three types of edges indicates if node i nominated node j, and the edge weight gives the frequency of this nomination. Students 1-12 are boys and 13-29 are girls. The KONECT version of this network is the collapse of de Domenico's multiplex version.[^icon]
+[^icon]: Description obtained from the [ICON](https://icon.colorado.edu) project."""
 tags = ['Social', 'Offline', 'Multilayer', 'Unweighted', 'Metadata']
 url = 'https://comunelab.fbk.eu/data.php'
 citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://www.google.com/search?q=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&oq=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&ie=UTF-8#q=%22Representing+Classroom+Social+Structure%22')]

diff --git a/entries/7th_graders/__init__.py b/entries/7th_graders/__init__.py
new file mode 100644
index 0000000..ec1e7df
--- /dev/null
+++ b/entries/7th_graders/__init__.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 Tiago de Paula Peixoto <tiago@skewed.de>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from .. import *
+
+title = "Vickers 7th Graders (1981)"
+description = "A small multiplex network of friendships among 29 seventh grade students in Victoria, Australia. Students nominated classmates for three different activities (who do you get on with in the class, who are your best friends, and who would you prefer to work with). Edge direction for each of these three types of edges indicates if node i nominated node j, and the edge weight gives the frequency of this nomination. Students 1-12 are boys and 13-29 are girls. The KONECT version of this network is the collapse of de Domenico's multiplex version."
+tags = ['Social', 'Offline', 'Multilayer', 'Unweighted', 'Metadata']
+url = 'https://comunelab.fbk.eu/data.php'
+citation = [('M. Vickers and S. Chan, "Representing Classroom Social Structure." Melbourne: Victoria Institute of Secondary Education, (1981).', 'https://www.google.com/search?q=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&oq=M.+Vickers+%26+S.+Chan%2C+"Representing+Classroom+Social+Structure."+Melbourne%3A+Victoria+Institute+of+Secondary+Education+(1981)&ie=UTF-8#q=%22Representing+Classroom+Social+Structure%22')]
+icon_hash = '56cde232a6d70217090cdb87'
+ustream_license = ('Open Data Commons Open Database License (ODbL)', 'https://opendatacommons.org/licenses/odbl/')
+upstream_prefix = 'https://comunelab.fbk.eu/data'
+files = [('Vickers-Chan-7thGraders_Multiplex_Social.zip', None, 'comunelab')]
+
+def fetch_upstream(force=False):
+    return fetch_upstream_files(__name__.split(".")[-1], upstream_prefix, files,
+                                force)
+
+@cache_network()
+@coerce_props()
+@annotate()
+def parse(alts=None):
+    global files
+    name = __name__.split(".")[-1]
+    for fnames, alt, fmt in files:
+        if alts is not None and alt not in alts:
+            continue
+        if isinstance(fnames, str):
+            fnames = [fnames]
+        with ExitStack() as stack:
+            fs = [stack.enter_context(open_upstream_file(name, fn, "rb")) for fn in fnames]
+            g = parse_graph(fs, fmt, directed=True)
+        yield alt, g