1. S. L. Berberyan, “The Distribution of Values of Harmonic Functions in the Unit Disk,” Izv. Vyssh. Uchebn. Zaved. Mat., No. 6, 12–19 (2011) [Russian Mathematics (Iz. VUZ) 55 (6), 12–19 (2011)].
2. V. I. Gavrilov, V. S. Zakharyan, and A.V. Subbotin, “Linear-Topological Properties of Maximal Hardy Spaces of Harmonic Functions in the Disk,” Dokl. NAN Armenii 102(3), 203–209 (2002).
3. S. L. Berberyan and V. I. Gavrilov, “Limit Sets of Continuous and Harmonic Functions Along Nontangent Boundary Paths,” Math. Montisnigri 1, 17–25 (1993).
4. Shinji Yamashita, “On Fatou- and Plessner-Type Theorems,” Proc. Japan. Acad. 46(6), 494–495 (1970).
5. S. L. Berberyan, “The Angular Limits of Harmonic Functions Defined in a Unit Circle,” Vestnik Mosk. Univ. Ser. Matem., Mekh., No. 1, 55–57 (2007).