共 50 条
- [21] THE CENTER-FOCUS PROBLEM AND BIFURCATION OF LIMIT CYCLES IN A CLASS OF 7TH-DEGREE POLYNOMIAL SYSTEMS JOURNAL OF APPLIED ANALYSIS AND COMPUTATION, 2016, 6 (03): : 817 - 826
- [22] LIMIT CYCLES OF DISCONTINUOUS PIECEWISE QUADRATIC AND CUBIC POLYNOMIAL PERTURBATIONS OF A LINEAR CENTER DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B, 2019, 24 (04): : 1769 - 1784
- [26] Seven large-amplitude limit cycles in a cubic polynomial system INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS, 2006, 16 (02): : 473 - 485
- [29] Center conditions and limit cycles in a cubic system of differential equations Differential Equations, 2000, 36 : 113 - 119