@article{MAN_1963__149_161015,
     author = {J. SCHUBART},
     title = {Ebene und r\"aumliche periodische {L\"osungen} des {Hillschen} {Problems.}},
     journal = {Mathematische Annalen},
     pages = {131--143},
     year = {1963},
     volume = {149},
     zbl = {0124.39603},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__149_161015/}
}