Mbachu, V.M., O. R. Okeke, A. E. Chinweze, and E. O. Akintona. “Diagnostic Analysis of Operations in a Manufacturing System Using Goal Programming Model”. International Research Journal of Scientific Studies 1, no. 1 (August 15, 2024): 32–41. Accessed September 28, 2025. https://irjss.com/index.php/journal/article/view/6.