%0 Journal Article %A Leonid A. Cherkas %A Joan C. Artés %A Jaume Llibre %T Quadratic systems with limit cycles of normal size %J Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica %D 2003 %P 31-46 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/BASM_2003_1_a3/ %G en %F BASM_2003_1_a3