scientific article published in 1988
author: Gaspar Barreira, M. Abreu, Augusto Casaca, Sergio Ramos, Luís Peralta, Paula Bordalo, Joäo Varela, Amelia Maio, Mario Pimenta, Philippe Busson, Didier Claude Contardo, Marc Bedjidian, Claude Charlot, Carlos Lourenco
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