@article{AL_1973_12_3_a8,
     author = {K. W. Roggenkamp},
     title = {Relation modules of finite groups and related topics},
     journal = {Algebra i logika},
     pages = {351--359},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_3_a8/}
}