@article{MAN_1960__140_160785,
     author = {K. KOPFERMANN},
     title = {Periodenrelationen ausgearteter komplexer {Periodentori.}},
     journal = {Mathematische Annalen},
     pages = {334--343},
     publisher = {mathdoc},
     volume = {140},
     year = {1960},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1960__140_160785/}
}