1. Djrbashian, M.M.: Integral Transforms and Representation of Functions in the Complex Domain. Nauka, Moscow (1966). (Russian)
2. Grishin, A.F., Malyutin, K.G.: Trigonometrically Convex Functions. South-West State Univ., Kursk (2015). (Russian)
3. Grishin, A.F., Sodin, M.L.: Growth on a ray, distribution of zeros in terms of their arguments for entire functions of finite order, and a uniqueness theorem. Teor. Funktsii, Funktsional. Anal. i Prilozhen. 50, 47-61 (1988) (Russian)
4. English transl. in J. Soviet Math. 49(6), 1269-1279 (1990)
5. Hayman, W., Kennedy, P.: Subharmonic Functions. Academic Press, London (1976)