@article{MZ_1972__126_171732,
     author = {Heinrich Steinlein},
     title = {Ein {Satz} \"uber den {Leray-Schauderschen} {Abbildungsgrad.}},
     journal = {Mathematische Zeitschrift},
     pages = {176--208},
     year = {1972},
     volume = {126},
     zbl = {0223.47023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171732/}
}