Montarcih Limantara, Lily, Mohammad Bisri, and Rizq Fajrianto. 2019. “Optimization of Water Usage at Irrigation Area of Pakis-Malang Regency-Indonesia by Using Linear Programming”. International Journal of Engineering & Technology 7 (4): 6432-36. https://doi.org/10.14419/ijet.v7i4.21055.