@article{INTO_1999_69_a4,
     author = {Hans Opolka},
     title = {Lifting problems in group cohomology and applications},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {168--192},
     year = {1999},
     volume = {69},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_1999_69_a4/}
}