فهرس المقالات Inventory . Learning effect . Inflation . Random planning horizon . Permissible delay in payment حرية الوصول المقاله صفحة الملخص نص كامل 1 - A production-inventory model with permissible delay incorporating learning effect in random planning horizon using genetic algorithm Mohuya B. Kar Shankar Bera Debasis Das Samarjit Kar