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…holomorphic automorphism groups of hyperbolic manifolds, fixed point theorems. Some of his research became well known and got significant following. His first article, while an undergraduate at Moscow State University (“An improvement in the smoothness of the functions in A. N. Kolmogorov's theorem on superpositions”, Dokl. Akad. Nauk SSSR, 177:5 (1967), …
https://www.wichita.edu/profiles/academics/fairmount_college_of_liberal_arts_and_sciences/Math/Faculty/Fridman-Buma.php