@article{MZ_1976__149_172373,
     author = {Denis Sjerve},
     title = {Group {Actions} and {Generalized} {Preriodicity.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--12},
     year = {1976},
     volume = {149},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__149_172373/}
}