THE PERIOD FUNCTION IN A CLASS OF QUADRATIC KOLMOGOROFF SYSTEMS

MARCO URIBE S., MYRNA WALLACE
2000 Proyecciones  
In this paper we consider the family of quadratic Kolmogoroff systems with a center in the real quadrant: .
doi:10.4067/s0716-09172000000200006 fatcat:ltjtmi6evbftravwkkzr7rkhdq