A criterion for p -valently starlike functions. Owa, Shigeyoshi; Nunokawa, Mamoru; Fukui, Seiichi — 1994 International Journal of Mathematics and Mathematical Sciences
An application of the Ruscheweyh derivatives. Owa, Shigeyoshi; Fukui, Seiichi; Sakaguchi, Koichi; Ogawa, Shotaro — 1986 International Journal of Mathematics and Mathematical Sciences