Rafael Berlanga Llavori Juan Manuel Pérez María José Aramburu Cabo Dolores María Llidó Techniques and Tools for the Temporal Analysis of Retrieved Information. 72-81 2001 conf/dexa/2001 DEXA http://link.springer.de/link/service/series/0558/bibs/2113/21130072.htm db/conf/dexa/dexa2001.html#LlavoriPCL01