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This work was supported by a grant of the “Schweizerische Nationalfonds”. The author would like to thank A. Pfluger for several substantial improvements.
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Boutellier, R. Curvature and functions with bounded boundary rotation. Math Z 177, 395–400 (1981). https://doi.org/10.1007/BF01162071
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DOI: https://doi.org/10.1007/BF01162071