Fajar, Muhammad, Oktya Putri Gitaningtyas, Muhammad Muhtoni, and Purwaning Dhahari. 2019. “The Estimation of Production Function and Technical Efficiency Shallot Farming”. Jurnal Matematika MANTIK 5 (1):50-59. https://doi.org/10.15642/mantik.2019.5.1.50-59.