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Alfredo Ardila, Universidad Nacional, Autonóma De, México México, D México. "G GU UÍ ÍA A P PA AR RA A E EL L D DI IA AG GN NÓ ÓS ST TI IC CO O N NE EU UR RO OP PS SI IC CO OL LÓ ÓG GI IC CO O."