@article{MAN_1923__88_158979,
     author = {H. Falckenberg},
     title = {Zur {Theorie} der {Kleinschen} {Erg\"anzungsrelationen.} {(Erste} {Mitteilung)}},
     journal = {Mathematische Annalen},
     pages = {123--135},
     publisher = {mathdoc},
     volume = {88},
     year = {1923},
     zbl = {48.0452.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__88_158979/}
}