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Valera, Sergi, and Tomeu Vidal. "La Percepción Social Del Riesgo. Una Aproximación Metodológica." In Culture, Quality of Life - Problems and Challenges for the New Millennium: IAPS 17 Conference Proceedings, 395-396. IAPS. A Coruña, Spain, 2002.
Valera, Sergi, and Joan Guardia. Urban Sustainability and Social Identity: Barcelona's Olympic Village In Metropolis 2000 - Which Perspectives? Cities, Social Life and Sustainable Development: IAPS 16 Conference Proceedings on CD-Rom. IAPS. Paris, France, 2000.
Valera, Sergi, and Enric Pol. "The Image of the Districts of Barcelona Iii. a Theoretical Approach." In Socio-environmental Metamorphoses: Proceedings 12th International Conference of the IAPS. IAPS. Halkidiki, Greece: Aristotle University Press, 1992.