Khang, Nguyen Van, and Thai Manh Cau. 2004. “Calculating Periodic Vibrations of Nonlinear Autonomous Multi-Degree-of-Freedom Systems by the Incremental Harmonic Balance Method”. Vietnam Journal of Mechanics 26 (3). Hanoi, Vietnam:157-66. https://doi.org/10.15625/0866-7136/26/3/5700.