Hoffman, R. M., D.W. Dinehart, S.P. Gross, J.R. Yost, and J.M. Hennessey. 2005. “Effects of Cope Geometry on the Strength and Behavior of Cellular and Castellated Beams”. Engineering Journal 42 (4):261-72. https://doi.org/10.62913/engj.v42i4.859.