@article{GDZPPN002425270, title = {Curvature and Functions with Bounded Boundary Rotation.}, journal = {Mathematische Zeitschrift}, volume = {177}, year = {1981}, pages = {395-400}, zbl = {0442.30010}, url = {http://dml.mathdoc.fr/item/GDZPPN002425270} }
Boutellier, Roman. Curvature and Functions with Bounded Boundary Rotation.. Mathematische Zeitschrift, Tome 177 (1981) pp. 395-400. http://gdmltest.u-ga.fr/item/GDZPPN002425270/