@article{PORMA_1960__19_2_114834,
     author = {Endler, Otto},
     title = {�?ber {Potenzreihen} in filtrierten {Gruppen}},
     journal = {Portugaliae mathematica},
     pages = {81--99},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1960},
     mrnumber = {0133371},
     zbl = {0117.27002},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1960__19_2_114834/}
}