What is a double central extension ? (the question was asked by Ronald Brown)
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 32 (1991) no. 3, pp. 191-201.
@article{CTGDC_1991__32_3_191_0,
author = {Janelidze, George},
title = {What is a double central extension ? (the question was asked by {Ronald} {Brown)}},
journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
pages = {191--201},
publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
volume = {32},
number = {3},
year = {1991},
zbl = {0762.18003},
mrnumber = {1158108},
language = {en},
url = {http://www.numdam.org/item/CTGDC_1991__32_3_191_0/}
}
TY  - JOUR
AU  - Janelidze, George
TI  - What is a double central extension ? (the question was asked by Ronald Brown)
JO  - Cahiers de Topologie et Géométrie Différentielle Catégoriques
PY  - 1991
DA  - 1991///
SP  - 191
EP  - 201
VL  - 32
IS  - 3
PB  - Dunod éditeur, publié avec le concours du CNRS
UR  - http://www.numdam.org/item/CTGDC_1991__32_3_191_0/
UR  - https://zbmath.org/?q=an%3A0762.18003
UR  - https://www.ams.org/mathscinet-getitem?mr=1158108
LA  - en
ID  - CTGDC_1991__32_3_191_0
ER  - 
Janelidze, George. What is a double central extension ? (the question was asked by Ronald Brown). Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 32 (1991) no. 3, pp. 191-201. http://www.numdam.org/item/CTGDC_1991__32_3_191_0/

1 R. Brown & G.J. Ellis, 'Hopf formulae for the higher homology of a group', Bull. London Math. Soc. 20 (1988) 124-128. | MR 924238 | Zbl 0611.20032

2 G. Janalidze, 'Pure Galois theory in categories', J. Algebra 132 (1990) 270-286. (First version was available as UCNW Preprint 87.20, Bangor, 1987.) | MR 1061480