@article{MZ_1918__2_167493,
     author = {P. Epstein},
     title = {\"Uber {M\"obiuskettenbr\"uche} und {Elementarkettenbr\"uche}},
     journal = {Mathematische Zeitschrift},
     pages = {412--432},
     publisher = {mathdoc},
     volume = {2},
     year = {1918},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1918__2_167493/}
}