Ngo, Tran, Tien Le, and Yen Tran. “Innovation and Firm Performance: Is R&D Worth It? An Empirical Case of Vietnam Enterprises”. VNUHCM Journal of Economics - Law and Management 6, no. 1 (November 2, 2021): 2039-2050. Accessed October 23, 2025. http://stdjelm.scienceandtechnology.com.vn/index.php/stdjelm/article/view/790.