@article{MAN_1930__102_159376,
     author = {H. Geppert},
     title = {Theorie der adiabatischen {Invarianten} allgemeiner {Differentialsysteme}},
     journal = {Mathematische Annalen},
     pages = {193--243},
     publisher = {mathdoc},
     volume = {102},
     year = {1930},
     zbl = {55.0888.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1930__102_159376/}
}