LI, Pengyang. Research article: Spatial Prediction of Soil pH Values in Hunan Province Based on Multi-source Environmental Variables and Machine Learning Models. Highlights in Science, Engineering and Technology, [S. l.], v. 122, p. 104–109, 2024. DOI: 10.54097/2yn2eb70. Disponível em: https://drpress.org/ojs/index.php/HSET/article/view/28283. Acesso em: 4 aug. 2026.