Tola, E. (2018) “Determining soil organic carbon concentration in agricultural fields using a handheld spectroradiometer: Implication for soil fertility measurement”, International Journal of Agricultural and Biological Engineering, 11(6), pp. 13–19. Available at: https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/4061 (Accessed: 27 February 2026).