Nguyen, Anh Phong, Anh Vu Nguyen, Thi Hong Minh Ho, and Thi Thanh Truc To. 2021. “Diversification of Business and Technical Efficiency of Companies in Vietnam”. Journal of Eastern European and Central Asian Research (JEECAR) 8 (4):481-94. https://doi.org/10.15549/jeecar.v8i4.772.