@article{JRAM_1931__164_149757,
     author = {F. Klein},
     title = {Zur {Theorie} der {Systeme} von {Potenzproduktkongruenzen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {141--150},
     publisher = {mathdoc},
     volume = {164},
     year = {1931},
     zbl = {0001.19601},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1931__164_149757/}
}