D. K. Lee and S. M. Shin and J. H. Lee, Topology Optimization of Structures with Web-Openings. journal = {International Journal of Architectural and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology. February 2014, vol. 92(8). 944 - 947 [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10003941.