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@article{MAN_1966__164_161393, author = {B. HUPPERT}, title = {Zur {Gasch\"utzschen} {Theorie} der {Formationen.}}, journal = {Mathematische Annalen}, pages = {133--141}, publisher = {mathdoc}, volume = {164}, year = {1966}, zbl = {0136.28503}, url = {http://geodesic.mathdoc.fr/item/MAN_1966__164_161393/} }
B. HUPPERT. Zur Gaschützschen Theorie der Formationen.. Mathematische Annalen, Tome 164 (1966), pp. 133-141. http://geodesic.mathdoc.fr/item/MAN_1966__164_161393/