@article{MM2_1971__5_154080,
     author = {Irene Pieper},
     title = {Zur {Theorie} endlicher geschlitzter {Inzidenzgruppen.}},
     journal = {Manuscripta mathematica},
     pages = {359--372},
     publisher = {mathdoc},
     volume = {5},
     year = {1971},
     zbl = {0222.50026},
     url = {http://geodesic.mathdoc.fr/item/MM2_1971__5_154080/}
}