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Surahman, D N and Taufik, Y and Nudianti, D P and Rahman, T (2021) Formulation and production costs optimization of complementary food for breast milk from red sorghum flour (sorghum bicolor l.), red bean flour (phaseolus vulgaris l.) and mungbean flour (phaseolus radiatus l.) using linear programming method. IOP Conference Series: Earth and Environmental Science, 672 (1). 012057. ISSN 1755-1307