1. Chyzhykov, I.: Growth and representation of analytic and harmonic functions in the unit disk. Ukr. Math. Bull. 3(1), 31–44 (2006)
2. Chyzhykov, I.: A generalization of Hardy–Littlewood’s theorem. Math. Methods Physicomech. Fields 49(2), 74–79 (2006) (in Ukrainain)
3. Chyzhykov, I.: On a complete description of the class of functions without zeros analytic in a disk and having given orders. Ukr. Math. J. 59(7), 1088–1109 (2007)
4. Chyzhykov, I.: Approximation of subharmonic functions by analytic ones and asymptotic properties of meromorphic functions in a disc. Habilitation Thesis, Lviv (2008) (in Ukrainain)
5. Djrbashian, M.M.: Integral Transforms and Representations of Functions in the Complex Domain. Nauka, Moscow (1966) (in Russian)