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Mauricio Otaíza Morales,  The Epistemological Crisis in the Theory of Vittorio Guidano.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. April 2008, vol. 16(4). 279 - 282[viewed 22 September 2018]. Available from: http://waset.org/publications/12812.