Duc Dien, Nguyen, 		Le Ai Vinh, Nguyen, AND 		Van Hai, Nong.
"Phân lập Evaluating the Growth and Nitrogen Fixation of Nostoc Cyanobacterial Strains Isolated from Agriculture Soils  in Nghe An Province" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 34 Number 4 (23 December 2018)