GerasimenkoV. I., MalyshevP. V., and RebenkoA. L. “On D. Ya. Petrina’s Works in Contemporary Mathematical Physics”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 46, no. 4, Apr. 1994, pp. 317–328, https://umj.imath.kiev.ua/index.php/umj/article/view/5728.