Description:
Gorbaichuk, V. I. On some properties of the Hadamard products of functions which are regular in the disk / V. I. Gorbaichuk, V. I. Kuz'mich // Ukrainian Mathematical Journal. - 1975. - V. 27, Issue 1. - pp. 56-62. https://link.springer.com/article/10.1007%2FBF01085841