Singular Points of Quadratic Systems: a Complete Classification in the Coefficient Space R12. - Joan C. Artés; Jaume Llibre; Nicolae Vulpe (Int. J. Bifurc. Chaos, 2008)

Invariants and symbolic calculations in the theory of quadratic differential systems. - Dana Schlomiuk; Nicolae Vulpe (ACM Commun. Comput. Algebra, 2010)

Applications of Symbolic Calculations and Polynomial Invariants to the Classification of Singularities of Differential Systems. - Dana Schlomiuk; Nicolae Vulpe (CASC, 2013)

Bifurcation Diagrams and Quotient Topological Spaces Under the Action of the Affine Group of a Family of Planar Quadratic Vector Fields. - Oxana Cerba Diaconescu; Dana Schlomiuk; Nicolae Vulpe (Int. J. Bifurc. Chaos, 2015)

Global Analysis of Riccati Quadratic Differential Systems. - Joan C. Artés; Jaume Llibre; Dana Schlomiuk; Nicolae Vulpe (Int. J. Bifurc. Chaos, 2024)