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2. The extended EOQ repair and waste disposal model;Richter;International Journal of Production Economics,1996
3. The EOQ repair and waste disposal model with variable setup numbers;Richter;European Journal of Operational Research,1996
4. Modellierung von kombinierten Wiederverwendungs- und Ent-sorgungsprozenssen;Richter,1996
5. Pure and mixed strategies for th EOQ repair and waste disposal problem;Richter;OR Spektrum,1997