Mkrtchyan, S. E. “ON UNIQUENESS OF HOLOMORPHIC AND BOUNDED OUTSIDE THE CLOSED LOGARITHMIC SECTOR FUNCTIONS REPRESENTABLE BY LACUNARY POWER SERIES”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 43, no. 1 (218), Feb. 2009, pp. 61-63, doi:10.46991/PYSU:A/2009.43.1.061.