@article{10_2298_PIM0795003C,
     author = {Crvenkovi\'c, Sini\v{s}a and Tasi\'c, Vladimir},
     title = {Second cohomology and nilpotency class 2.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {3},
     publisher = {mathdoc},
     volume = {81(95)},
     year = {2007},
     doi = {10.2298/PIM0795003C},
     zbl = {1186.20034},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.2298/PIM0795003C/}
}