@article{GDZPPN002216418, title = {Zur Theorie endlicher geschlitzter Inzidenzgruppen.}, journal = {Manuscripta mathematica}, volume = {4}, year = {1971}, pages = {359-372}, zbl = {0222.50026}, url = {http://dml.mathdoc.fr/item/GDZPPN002216418} }
Pieper, Irene. Zur Theorie endlicher geschlitzter Inzidenzgruppen.. Manuscripta mathematica, Tome 4 (1971) pp. 359-372. http://gdmltest.u-ga.fr/item/GDZPPN002216418/