“AN EOQ MODEL FOR NON-INSTANTANEOUS DETERIORATING ITEM WITH TWO- PHASE DEMAND RATES, TIME-DEPENDENT LINEAR HOLDING COST AND TIME- DEPENDENT PARTIAL BACKLOGGING RATE UNDER TRADE CREDIT POLICY”. The Transactions of the Nigerian Association of Mathematical Physics, vol. 17, Dec. 2021, pp. 131–144, https://nampjournals.org.ng/index.php/tnamp/article/view/203.