2篇外文文献求助

【题 名】： Optimal policies for the capacitated two stage multi-item inventory model with joint setup costs Original Research Article
  【作 者】： Omer Kirca, Melih Kökten
  【期刊、会议、单位名称】：Operations Research Letters
  【年, 卷(期), 起止页码】：Volume 14, Issue 1, August 1993, Pages 43–48
  【全文链接】：http://www.sciencedirect.com/science/article/pii/016763779390018C

  【题 名】： A new heuristic approach for the multi-item dynamic lot sizing problem
  【作 者】： Omer Kirca, Melih Kökten S Viswanathan
  【期刊、会议、单位名称】：European Journal of Operational Research
  【年, 卷(期), 起止页码】：Volume 75, Issue 2, 9 June 1994, Pages 332–341
  【全文链接】：http://www.sciencedirect.com/science/article/pii/0377221794900787

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