Li Chao-Gang, Wang Mao-Sheng, Fang Quan, Peng Xue-Cheng, Huang Wan-Xia. Applications of representation transformation and secular perturbation theory to coupled Duffing equationsJ. Acta Physica Sinica, 2021, 70(2): 024601. DOI: 10.7498/aps.70.20201057