A certain class of multivalent functions (Q1372226)

The object of the present paper is to derive several properties of a certain class of multivalent functions in the open unit disk. One of the main theorems proven here is shown to unify and extend several earlier results in the theory of analytic functions due, for example, to \textit{R. Singh} and \textit{S. Singh} [Colloq. Math. 47, 309-314 (1982; Zbl 0526.30015)], \textit{H. Saitoh, M. Nunokowa, S. Fukui}, and \textit{S. Owa} [Bull. Soc. R. Sci. Liège 57, No. 3, 137-141 (1988; Zbl 0671.30009)], and \textit{M. Nunokawa} [Proc. Japan. Acad., Ser. A 65, No. 6, 163-164 (1989; Zbl 0704.30022)].