A. F. Andreev, P. D. Khody-Zade, “Investigation of the problem of the center and focus in one case”, Differ. Uravn., 1984, Volume 20, Number 2,Pages <nobr>187

Ordinary Differential Equations

Investigation of the problem of the center and focus in one case

A. F. Andreev^a, P. D. Khody-Zade^b

^a Leningrad State University
^b A. Navoi Samarkand State University

UDC: 517.925.11

Received: 05.03.1982