On sufficient condition to be in a certain subclass of starlike functions defined by subordination

An interesting criterion was given by Tuneski [N. Tuneski, On the quotient of the representations of convexity and starlikeness, Math. Nachr. 248-249 (2003) 200-203] for the analytic functions to be in the class S∗[1+Az1+Bz] and its subclasses, where -1⩽B