On stationary functions. (English. Russian original) Zbl 0614.47025
Vestn. Leningr. Univ., Math. 18, 7-14 (1985); translation from Vestn. Leningr. Univ. 1985, No. 22, Mat. Mekh. Astron. No. 4, 7-14 (1985).
Reviewer: Yu.Latushkin