@article{10_21136_CMJ_1979_101572,
     author = {Garfinkel, Gerald S. and Wu, Yel-Chiang},
     title = {Cohomology and special extensions of groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1979},
     doi = {10.21136/CMJ.1979.101572},
     mrnumber = {518134},
     zbl = {0437.20040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101572/}
}