@article{MM2_1977__23_154511,
     author = {H. M\"onch and G.-F. v. Harten},
     title = {The {Product} {Formula} for the {Topological} {Degree} of {Strict} {...-Contractions.}},
     journal = {Manuscripta mathematica},
     pages = {113--124},
     publisher = {mathdoc},
     volume = {23},
     year = {1977},
     zbl = {0366.47030},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__23_154511/}
}