N. N. Linh, V. A. Tuan, N. V. Tuan and N. D. Anh, Response analysis of undamped primary system subjected to base excitation with a dynamic vibration absorber integrated with a piezoelectric stack energy harvester, Vietnam J. Mech. 44 (2022) 490–499. DOI: https://doi.org/10.15625/0866-7136/17948.