@article{MAN_1905__60_158180,
     author = {M. Dehn},
     title = {\"Uber den {Inhalt} sph\"arischer {Dreiecke.}},
     journal = {Mathematische Annalen},
     pages = {166--174},
     publisher = {mathdoc},
     volume = {60},
     year = {1905},
     zbl = {36.0526.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1905__60_158180/}
}