-  Mayu Iwata, Yuki Arase, Takahiro Hara, and Shojiro Nishio, "A Children-Oriented Re-Ranking Method for Web Search Engines," Proc. of Int'l Conference on Web Information System Engineering (WISE 2010), pages 225-239 December 2010.
-  Kin F. Li, Yali Wang, Shojiro Nishio, and Wei Yu, "A Formal Approach to Evaluate and Compare Internet Search Engines: a Case Study on Searching the Chinese Web," In Proc. of Asia Pacific Web Conf. (APWeb 2005), pages 195-206 March 2005.