Iskakov, S.A., and A.O. Tanin. “Professor Bokayev’s Mathematical Olymp: Celebrating the Scholar’s 70th Anniversary”. Bulletin of the Karaganda University. Mathematics Series, vol. 121, no. 1, Mar. 2026, pp. 248-9, https://mts.buketov.edu.kz/mathematics-vestnik/article/view/1220.