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3. Close-to-convex schlicht functions;Kaplan, Wilfred;Michigan Math. J.,1952
4. A note on extremal problems for certain classes of analytic functions;Kirwan, W. E.;Proc. Amer. Math. Soc.,1966
5. On the distortion of conformal mappings with bounded boundary rotation;Lehto, Olli;Ann. Acad. Sci. Fennicae Ser. A. I. Math.-Phys.,1952