Pingguang, Zhang On the Distribution and Number of Limit Cycles for Quadratic Systems with Two Foci 2002 - Edicions de la Universitat de Lleida Is part of Qualitative Theory of Dynamical Systems : 3, 2, 2002 Permissions Download Copy/paste Printing Download | NO Copy/paste | NO Printing EUR 6.00 VAT Excluded Purchase PDF a Article
