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Kampker, A. , Deutskens, C. , Heimes, H. , Ordung, M. , Optehostert, F.. "Cost Valuation Method for Development Concurrent Phase Appropriate Requirement Valuation Using the Example of Load Carrier Development in the Lithium-Ion-Battery Production". World Academy of Science, Engineering and Technology, Open Science Index 108, International Journal of Industrial and Manufacturing Engineering (2015), 9(12), 2106 - 2111.