@article{MZ_1923__18_167759,
     author = {M. Lagally},
     title = {Die isometrische {Verbiegung} einer {Fl\"ache} durch schrittweise {N\"ahe-rung}},
     journal = {Mathematische Zeitschrift},
     pages = {312--323},
     publisher = {mathdoc},
     volume = {18},
     year = {1923},
     zbl = {49.0517.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1923__18_167759/}
}