An application of the Ruscheweyh derivatives. Owa, Shigeyoshi; Fukui, Seiichi; Sakaguchi, Koichi; Ogawa, Shotaro — 1986 International Journal of Mathematics and Mathematical Sciences
A Note on Length Distortion for Certain Classes of Analytic Functions Shigeyoshi Owa; Shotaro Ogawa — 1988 Publications de l'Institut Mathématique