Xuefei, Liu, Zhang Shiqing, and Luo Jianmei. “ON PERIODIC SOLUTIONS FOR NESTED POLYGON PLANAR 2N+1-BODY PROBLEMS WITH ARBITRARY MASSES”. Italian Journal of Pure and Applied Mathematics 27 (December 15, 2010): 63–80. Accessed June 13, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/5900.