Patiyuth, S. (1991) “Survival of Rhizobia in Various Rations of Peat and Lignite ”, Thai Agricultural Research Journal, 9(3), pp. 157–161. available at: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/242389 (accessed: 1 October 2026).