Akito Nishitarumizu Tsuyoshi Itokawa Teruaki Kitasuka Masayoshi Aritsugi Improving a News Recommendation System in Adapting to Interests of a User with Storage of a Constant Size. 109-115 2010 APWeb http://doi.ieeecomputersociety.org/10.1109/APWeb.2010.66 conf/apweb/2010 db/conf/apweb/apweb2010.html#NishitarumizuIKA10