@article{MAN_1974__207_162531,
     author = {Peter Hess},
     title = {A {Homotopy} {Argument} for {Mappings} of {Monotone} {Type} in {Banach} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {63--66},
     publisher = {mathdoc},
     volume = {207},
     year = {1974},
     zbl = {0254.47074},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__207_162531/}
}