@article{10_1017_S0017089500003724,
     author = {Opolka, Hans},
     title = {The twisted group algebra of a finite nilpotent group over a number field},
     journal = {Glasgow mathematical journal},
     pages = {55--61},
     year = {1979},
     volume = {20},
     number = {1},
     doi = {10.1017/S0017089500003724},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003724/}
}