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3. Hadley, G. andT. M. Within: Analysis of Inventory Systems, Prentice Hall, Inc., Englewood Cliffs, New Jersey 1963.
4. Hurter, A. P. andF. C. Kaminsky: Inventory Control with Random and Regular Replenishment, Journal of Industrial Engineering19, 380–385, 1968.
5. Ignall, E.: Optimal continuous review Policies for two product Inventory Systems with joint Setup Costs, Management Science15, 278–283, 1969.