@article{MAN_1940__117_160063,
     author = {E. Hopf},
     title = {Statistik der {L\"osungen} geod\"atischer {Probleme} vom unstabilen {Typus.} {II}},
     journal = {Mathematische Annalen},
     pages = {590--608},
     publisher = {mathdoc},
     volume = {117},
     year = {1940},
     zbl = {66.0827.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160063/}
}