MASAYNA, W. Use of Differences in Natural Abundance of 15 N for the Assessment of Nitrogen Fixation . Thai Agricultural Research Journal, [S. l.], v. 4, n. 2, p. 164–168, 1986. Disponível em: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245186. Acesso em: 1 oct. 2026.