%0 Journal Article
%A I. S. Kukles
%A L. B. Persidskaya
%T On extending Frommer's method of investigation of a singular point to a system of three differential equations
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1968
%P 44-54
%N 9
%U http://geodesic.mathdoc.fr/item/IVM_1968_9_a5/
%G ru
%F IVM_1968_9_a5