@article{MZ_1959__72_183600,
     author = {Eberhard Heinz},
     title = {\"Uber die {Differentialgleichung} 0 < ......rt - s{\texttwosuperior}...{\ss} < ...},
     journal = {Mathematische Zeitschrift},
     pages = {107--126},
     publisher = {mathdoc},
     volume = {72},
     year = {1959},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__72_183600/}
}