@article{ELMA_1976__31_141173,
     author = {Hans Walser},
     title = {Eine {\"Ubertragung} der {Formel} von {Gauss-Bonnet} auf ebene {Netze.}},
     journal = {Elemente der Mathematik},
     pages = {59--63},
     publisher = {mathdoc},
     volume = {31},
     year = {1976},
     zbl = {0328.53060},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1976__31_141173/}
}