Academic Editor: N. Govil
Copyright © 2010 Neslihan Uyanik et al. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
By means of a differential operator, we introduce and investigate some new subclasses
of -valently analytic functions with negative coefficients, which are starlike or convex of
complex order. Relevant connections of the definitions and results presented in this paper
with those obtained in several earlier works on the subject are also pointed out.