Cuong, Nguyen, 		Ngoc Anh, Giap, AND 		Minh Tuan, Bui.
" Characterization of Oceanographic Fields  in the Gulf of Tonkin and Their Relationship  with ENSO Using Cluster Analysis" <em>VNU Journal of Science: Earth and Environmental Sciences</em> [Online], Volume 41 Number 1S (14 November 2025)