@article{CM_1936__3__52_0,
     author = {Cohn-Vossen, Stefan},
     title = {Der approximative {Sinussatz} f\"ur kleine {Dreiecke} auf krummen {Fl\"achen} {(Auszug} aus einem {Brief} an {Prof.} {T.} {Levi-Civita)}},
     journal = {Compositio Mathematica},
     pages = {52--54},
     publisher = {Johnson Reprint Corporation},
     volume = {3},
     year = {1936},
     zbl = {0013.27804},
     language = {de},
     url = {http://www.numdam.org/item/CM_1936__3__52_0/}
}