Huyen, Phan, Tran Quang, Nguyen Dung, Nguyen Dong, Le Huy, and Pham Thuyet. 2024. “Research on Technical Practicesto Build ProcedureofF1Hybrid SeedProductionfor Two-LineHybrid Rice Variety HQ21”. Vietnam Journal of Agricultural Sciences 18 (12): 1093-1101. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/755.