@article{MZ_1919__5_167542,
     author = {H., Liebmann},
     title = {Die {Verbiegung} analytischer {Eifl\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {132--136},
     year = {1919},
     volume = {5},
     zbl = {47.0681.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__5_167542/}
}