Subhash Kumar, Ashok Kumar, and Madhu Jain. “Learning Effect on an Optimal Policy for Mathematical Inventory Model for Decaying Items under Preservation Technology With the Environment of COVID-19 Pandemic”. Malaya Journal of Matematik 8, no. 04 (October 1, 2020): 1694–1702. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1727.