Dai, Guo-Liang, Hua Yan, Ai-Guo Zhong, and Chuan-Feng Wang. 2010. “Cycloaddition Reaction Between Dibromovinylidene and Formaldehyde: A Density Functional Theory Study”. Asian Journal of Chemistry 22 (9):7187-96. https://asianpubs.org/index.php/ajchem/article/view/11967.