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1.Bastianoni S., Rugani B., Flaminio T. & E.B.P. Tiezzi (2009): Emergy can be described by means of set theory: implications on “emergy algebra”. In: Conference Handbook of ISEM 2009 Conference “Ecological Modelling for Enhanced Sustainability in Management”, 6th-9th October 2009, Laval University, Quebec City, PQ, Canada, p. 49.