T. Spiegel and J. Siegmann and C. F. Durach, Flexible Development and Calculation of Contract Logistics Services. journal = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. February 2014, vol. 87(3). 658 - 665 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/9997645.