NguyenV. D., NguyenV. D. and TranK. C. (2007) “Van der Pol oscillator under parametric and forced excitations”, Ukrains’kyi Matematychnyi Zhurnal, 59(2), pp. 206–216. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3304 (Accessed: 27July2024).