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Review: Theoretical Approaches: Ignacio Farías and José Ossandón,eds,Observando Sistemas,Nuevas Apropiaciones y Usos de la Teoría de Niklas Luhmann [Observing Systems: New Applications and Uses of the Theory of Niklas Luhmann]. Santiago de Chile: RiL editores,Fundación Soles,2006,394 pp.,ISBN 9562844862,12,500 pesos/$17.80