@article{JRAM_1981__326_152377,
     author = {Peter L\"offler},
     title = {Die {Existenz} freier {Zk-Operationen} auf rationalen {Homologiesph\"aren.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {171--186},
     publisher = {mathdoc},
     volume = {326},
     year = {1981},
     zbl = {0462.57017},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1981__326_152377/}
}