Tran, Duc, 		Duong, Nhan, 		Le, Tien, 		Nguyen, Duong, AND 		Nguyen, Man.
" A comparative study of enhancements of critical temperature in  Bi-Pb-Sr-Ca-Cu-O superconductors" <em>VNU Journal of Science: Mathematics - Physics</em> [Online], Volume 33 Number 3 (25 September 2017)