Luca Becchetti Ugo Maria Colesanti Alberto Marchetti-Spaccamela Andrea Vitaletti Self-Adaptive Recommendation Systems: Models and Experimental Analysis. 479-480 2008 SASO http://dx.doi.org/10.1109/SASO.2008.55 conf/saso/2008 db/conf/saso/saso2008.html#BecchettiCMV08