Conor Hayes Paolo Avesani Sriharsha Veeramachaneni An Analysis of the Use of Tags in a Blog Recommender System. 2772-2777 2007 conf/ijcai/2007 IJCAI http://dli.iiit.ac.in/ijcai/IJCAI-2007/PDF/IJCAI07-445.pdf db/conf/ijcai/ijcai2007.html#HayesAV07