@article{05296677,
title = {Second cohomology and nilpotency class 2.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {82(96)},
year = {2007},
pages = {3-10},
doi = {10.2298/PIM0795003C},
zbl = {1186.20034},
language = {en},
url = {http://dml.mathdoc.fr/item/05296677}
}
Crvenković, Siniša; Tasić, Vladimir. Second cohomology and nilpotency class 2.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 82(96) (2007) pp. 3-10. doi : 10.2298/PIM0795003C. http://gdmltest.u-ga.fr/item/05296677/