1. M. Tsuji, ?A theorem on the boundary behavior of meromorphic functions in |z|<1,? Comm. Math. Univ. St. Pauli,8, No. 1, 53?55 (1960).
2. I. P. Natanson, Theory of Functions of a Real Variable [in Russian], Gostekhizdat, Moscow (1957).
3. F. Bagemihl, ?Curvilinear cluster sets of arbitrary functions,? Proc. Nat. Acad. Sci.,41, 379?382 (1955).
4. M. Tsuji, ?Beurling's theorem on exceptional sets,? Tohoku Math. J.,2, No. 2, 113?125 (1950).
5. V. I. Gavrilov, ?On the distribution of values of nonnormal functions meromorphic in the unit disc,? Matem. Sb.67, No. 3, 408?427 (1965).