@article{MZ_1961__77_169980,
     author = {Herbert Seifert},
     title = {Zum {Satz} von {O.} {Bonnet} \"uber den {Durchmesser} einer {Eifl\"ache.}},
     journal = {Mathematische Zeitschrift},
     pages = {125--130},
     publisher = {mathdoc},
     volume = {77},
     year = {1961},
     zbl = {0192.28102},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__77_169980/}
}