Monitoring evergreen vegetation area in Song Ma district (Son La province) in the period of 1973 – 2022 from Landsat and Sentinel 2 satellite images - Nguyen Thien Phuong, Thao; Nguyen Trung, Hau; Nguyen Thi Thu, Ha; Pham Quang, Vinh; Hoang Thi Phuong, Thao (VNUHCM Journal of Advanced Research in Natural Sciences, 2024)