1. A. A. Borovkov, Probabilty Theory (Springer, London, 2013).
2. A. N. Shiryaev, Probabilty-1 (MTsNMO, Nezavis. Mosk. Univ., Moscow, 2011) [in Russian].
3. V. I. Rotar, Probability Theory (World Scientific, Singapore, 1997).
4. I. A. Ibragimov, Sh. K. Formanov, and E. L. Presman, ‘‘On modifications of the Lindeberg and Rotar’ conditions in the central limit theorem,’’ Theory Probab. Appl. 65, 648–651 (2021).
5. Sh. K. Formanov and E. L. Presman, ‘‘On the Kolmogorov–Prokhorov theorem on the existence of expectations of random sums,’’ Dokl. Math. 79, 293–295 (2009).