David Bueno Ricardo Conejo Amos David METIOREW: An Objective Oriented Content Based and Collaborative Recommending System. 310-314 2001 conf/ohs/2001 OHS-7/SC-3/AH-3 http://dx.doi.org/10.1007/3-540-45844-1_28 db/conf/ohs/ohs2001.html#BuenoCD01