Chen, Bang-Yen. “Some Open Problems and Conjectures on Submanifolds of Finite Type: Recent Development”. Tamkang Journal of Mathematics 45, no. 1 (March 30, 2014): 87–108. Accessed April 19, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1564.