Periodic solutions and their bifurcation of Duffing system with strong non-linearity
WANG Xu, LI Xinye, WANG Zhenjing, HAN Shankai
Journal of Hebei University (Natural Science Edition) . 2017, (5): 457 -463 .  DOI: 10.3969/j.issn.1000-1565.2017.05.003