%0 Journal Article
%A Dana Schlomiuk
%A Nicolae Vulpe
%T Integrals and phase portraits of planar quadratic differential systems with invariant lines of total multiplicity four
%J Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica
%D 2008
%P 27-83
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/BASM_2008_1_a3/
%G en
%F BASM_2008_1_a3