Dao, Thao Thi Bich, et al. “Exact Receptance Function of a Tapered AFG Beam With Nonlinearly Varying Ratios of Beam Properties Carrying Concentrated Masses”. <i>Vietnam Journal of Mechanics</i>, vol. 45, no. 4, Dec. 2023, pp. 296-17, doi:10.15625/0866-7136/19697.