Niwat Ruangpanit and Somnuek Pongumphai (1990) “Improvement and Development of Tin Mined Land for Forage Production”, Agriculture and Natural Resources. Bangkok, Thailand, 24(3), pp. 320–331. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/242223 (accessed: 10 April 2025).