On the number of limit cycles in quadratic perturbations of quadratic codimension-four centres

By Zhao Yulin  

Nonlinearity, Vol. 24, Iss. 9, 2011-09 ,pp. : 2505-2522

IOP Publishing

Access to resources Recommend Favorite

On an estimate of the number of limit cycles in a quadratic system

By Cherkas L.  

Differential Equations, Vol. 43, Iss. 5, 2007-05 ,pp. : 643-655

MAIK Nauka/Interperiodica

Access to resources Recommend Favorite

Normal-Size Limit Cycles of Quadratic Systems with a Structurally Unstable Focus

By Cherkas L. A.   Shevtsov I. L.  

Differential Equations, Vol. 40, Iss. 8, 2004-08 ,pp. : 1139-1148

MAIK Nauka/Interperiodica

Access to resources Recommend Favorite

On the asymptotics of the number of reduced integral quadratic forms with a condition of divisibility of the first coefficients

By Pachev U.  

Siberian Mathematical Journal, Vol. 48, Iss. 2, 2007-03 ,pp. : 300-310

Springer Publishing Company

Access to resources Recommend Favorite

Limit cycles of quadratic systems with a perturbed weak focus of order 3 and a saddle equilibrium at infinity

By Leonov G.  

Doklady Mathematics, Vol. 82, Iss. 2, 2010-10 ,pp. : 693-696

MAIK Nauka/Interperiodica

Access to resources Recommend Favorite