Li, C., Li, Z., Cen, S., Wu, C., Shang, Y., & Li, C. (2018). High-performance geometric nonlinear analysis with the unsymmetric 4-node, 8-DOF plane element US-ATFQ4. International Journal for Numerical Methods in Engineering. doi:10.1002/nme.5771

Li, Chenfeng, Zhi Li, Song Cen, Cheng-Jin Wu, Yan Shang, and Chen-Feng Li. "High-performance Geometric Nonlinear Analysis With the Unsymmetric 4-node, 8-DOF Plane Element US-ATFQ4." International Journal for Numerical Methods in Engineering 2018.

Li, Chenfeng, et al. "High-performance Geometric Nonlinear Analysis With the Unsymmetric 4-node, 8-DOF Plane Element US-ATFQ4." International Journal for Numerical Methods in Engineering 2018.