Bai, R., Liu, S., Liu, Y., & Chan, S. (2019). Direct analysis of tapered-I-section columns by one-element-per-member models with the appropriate geometric-imperfections. Engineering Structures, 183, 907-921. https://doi.org/10.1016/j.engstruct.2019.01.021

Bai, Rui, Si-Wei Liu, Yao-Peng Liu, and Siu-Lai Chan. "Direct Analysis of Tapered-I-section Columns by One-element-per-member Models with the Appropriate Geometric-imperfections." Engineering Structures 183 (2019): 907-921. https://doi.org/10.1016/j.engstruct.2019.01.021.

Bai, Rui, et al. "Direct Analysis of Tapered-I-section Columns by One-element-per-member Models with the Appropriate Geometric-imperfections." Engineering Structures, vol. 183, 2019, pp. 907-921, https://doi.org/10.1016/j.engstruct.2019.01.021.