J. Becker, Lownersche differentialgleichung and quasikonform fortsetzbare schlichte funktionen, J. Reine Angew. Math. 255 (1972) 23--43.
J. Becker and Ch. Pommerenke, Schlichtheitskriterien und Jordangebiete, J. Reine Angew. Math 354 (1984) 74--94.
P.L. Duren, Univalen Functions, Springer, New York 1978.
Y.C Kim and T. Sugawa, Norm estimates of the pre-schwarzian derivatives for certain classes of univalent functions, Proc. Edinb. Math. Soc. (2) 49 (2006), no. 1, 131--143.
Y. Okuyama, The norm estimates of pre-schwarzian derivatives of spiral-like functions, Complex Var. Theory Appl. 42 (2000), no. 3, 225--239.
S. Porwal and M. Darus, On a new subclass of bi-univalent functions, J. Egyptian Math. Soc. 21 (2013), no. 3, 190--193.
H.M. Srivastava, A.K. Mishra and P. Gochhayat, Certain subclasses of analytic and bi-univalent functions, Appl. Math. Lett. 23 (2010), no. 10, 1188--1192.
S. Yamashita, Norm estimates for function starlike or convex of order alpha, Hokkaido Math. J. 28 (1999) 217--230.