Zhang, R. R. “Value Distribution of Differential-Difference Polynomials of Meromorphic Functions”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 4 (April 25, 2018): 471–480. Accessed February 16, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/1569.