1. Delay of payment for extraordinary purchases;Arcelus,1988
2. Price discounts for extraordinary purchases;Arcelus,1988
3. Inventory policy for items on sale during regular replenishment;Baker;Prod. Inv. Manage.,1976
4. Optimal ordering policies under conditions of extended payment privileges;Davis;Manage. Sci.,1985
5. Inventory Systems;Naddor,1966