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Irina Astrova and  Arne Koschel and  Thole Schneider and  Johannes Westhuis and  Jürgen Westerkamp,  Shopping Cart System: Load Balancing and Fault Tolerance in the OSGi Service Platform.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. March 2014, vol. 87(3). 473 - 479[viewed 17 October 2018]. Available from: http://waset.org/publications/9997785.