Nguyen, Long D., Phan Le Tuan Tu, Tran Minh Tri, and Nguyen Kim Hoang Nam. 2024. “A Hybrid Approach to On-Grid and Off-Grid Solar Energy With Optimum Investment: A Case Study in Vietnam”. EAI Endorsed Transactions on Tourism, Technology and Intelligence 2 (1). https://doi.org/10.4108/eettti.6890.