@article{CMH_1968__43_139364,
     author = {Heinz Hopf and Yoshie Katsurada},
     title = {Some {Congruence} {Theorems} for {Closed} {Hypersurfaces} in {Riemann} {Space.} {(Part} {II:} {Method} based on a {Maximum} {Principle).}},
     journal = {Commentarii mathematici Helvetici},
     pages = {217--224},
     publisher = {mathdoc},
     volume = {43},
     year = {1968},
     zbl = {0163.43502},
     url = {http://geodesic.mathdoc.fr/item/CMH_1968__43_139364/}
}