Parameters Frequency of periodic solution Coefficients of Coefficients of ,15 144 0.4493 = 145.1550, = 0, = 14.5624, = 144.0742, = 6.4697, , = 0.1436, = 5.4934, = 0.2246, = 10.1666, = 2.7848, = 1.8553, , = 2.1951, = 0.2662, = 0.6613, = 0.9669, = 0.2440, = 0.2532, , = 0.2348, = 0.0137, = 0.1450, = −0.0645, = 0.0136, = −0.0840, , = −0.1554, = 0.0428, = −0.1121, = −0.0372, = −0.0474, = −0.0258, , = −0.0279, = −0.0246, = −0.0490, = −0.0125, = −0.0069, = 0.0066, , = 0.0285, = −0.0315, = 0.0357, = 0.0029, = 0.0103, = 0.0046, = −0.0013, = 0.0181, = 0.0183, = 0.0058, = 0.0028, = 0.0004, = −0.0008, = 0.0188, = −0.0096, = 0.0003, = −0.0022, = −0.0010, = 0.0062, = −0.0087, = −0.0069, = −0.0021, = −0.0009, = −0.0006, = −0.0036. = −0.0003, = 0.0008. ,7 144 3.3801 = 53.6688, = 0, = 3.4103, = 51.5728, = 1.6065, = 1.8614, , = 0.0293, = 0.2362, = 0.0065, = 0.1157, = 0.0192, = −0.0218, , = −0.0681, = −0.0073, = 0.0242, = −0.0103, = 0.0064, = 0.0036, , = 0.0019, = −0.0023, = 0.0012, = −0.0005, = −0.0007, = −0.0011, , = −0.0057, = −0.0016, = 0.0054, = −0.0005, = 0.0007, = 0.0006, , , ,50 144 , , , , , ,