[IEEE 2009 Fifth International Conference on Soft Computing, Computing with Words and Perceptions in System Analysis, Decision and Control (ICSCCW) - Famagusta, Cyprus (2009.09.2-2009.09.4)] 2009 Fifth International Conference on Soft Computing, Computing with Words and Perceptions in System Analysis, Decision and Control - An auction based mathematical model and heuristics for resource co-allocation problem in grids and clouds