@article{CMH_1947__20_138924,
     author = {Thiem Le-Van},
     title = {Beitrag zum {Typenproblem} der {Riemannschen} {Fl\"achen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {270--287},
     publisher = {mathdoc},
     volume = {20},
     year = {1947},
     zbl = {0029.03501},
     url = {http://geodesic.mathdoc.fr/item/CMH_1947__20_138924/}
}