Elenskiy Юрий Напалеонович. “In Memory of Lazar Borisovich Greifer (20.03.1945 – 14.02.2021)”. BULLETIN OF PERM UNIVERSITY. MATHEMATICS. MECHANICS. COMPUTER SCIENCE, no. 1(52) (December 13, 2021): 98–100. Accessed May 18, 2024. http://press.psu.ru/index.php/Math/article/view/5039.