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@article{MZ_1981__177_173072, author = {Roman Boutellier}, title = {Curvature and {Functions} with {Bounded} {Boundary} {Rotation.}}, journal = {Mathematische Zeitschrift}, pages = {395--400}, publisher = {mathdoc}, volume = {177}, year = {1981}, zbl = {0442.30010}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__177_173072/} }
Roman Boutellier. Curvature and Functions with Bounded Boundary Rotation.. Mathematische Zeitschrift, Tome 177 (1981), pp. 395-400. http://geodesic.mathdoc.fr/item/MZ_1981__177_173072/