TY  - JOUR
AU  - Dana Schlomiuk
AU  - Nicolae Vulpe
TI  - Integrals and phase portraits of planar quadratic differential systems with invariant lines of total multiplicity four
JO  - Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica
PY  - 2008
SP  - 27
EP  - 83
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/BASM_2008_1_a3/
LA  - en
ID  - BASM_2008_1_a3
ER  -