1. W. Rudin, Function Theory in the Unit Ball of ℂ n (Mir, Moscow, 1984; Springer, Heidelberg, 1981).
2. W. Rudin, Function Theory in Polydisks (Mir, Moscow, 1974; McGraw-Hill, New York, 1970).
3. I. I. Privalov, Boundary Properties of Single-Valued Analytic Functions (Izd. Moskov. Univ., Moscow, 1941) [in Russian].
4. H. O. Kim and Y. Y. Park, Tsukuba J. Math. 16(1), 11 (1992).
5. B. R. Choe and H. O. Kim, Complex Variables Theory Appl. 20(1–4), 53 (1992).