@article{MAN_1900__53_157984,
     author = {M. Dehn},
     title = {Die {Legendre'schen} {S\"atze} \"uber die {Winkelsumme} im {Dreieck}},
     journal = {Mathematische Annalen},
     pages = {404--439},
     publisher = {mathdoc},
     volume = {53},
     year = {1900},
     zbl = {31.0471.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1900__53_157984/}
}