Fajar, M., O. P. Gitaningtyas, M. Muhtoni, and P. Dhahari. “The Estimation of Production Function and Technical Efficiency Shallot Farming”. Jurnal Matematika MANTIK, vol. 5, no. 1, May 2019, pp. 50-59, doi:10.15642/mantik.2019.5.1.50-59.