-  Hara Takahiro Watanabe Toshiki Kanzaki Akimitsu and Nishio Shojiro, "An Update Propagation Strategy Considering Data Access Frequency in Peer-To-Peer Networks," In Proc. of DASFAA 2008, pages 661-669 March 2008.
-  Shinya Kitajima, Jing Cai, Tsutomu Terada, Takahiro Hara, and Shojiro Nishio, " a Query Processing Method Considering Query Frequency for Broadcast Database Systems," Proc. of Intl Workshop on Future Mobile and Ubiquitous Information Technologies (FMUIT 2006), pages 110-114 May 2006.
-  Wataru Uchida, Takahiro Hara, Etsuko Yajima, and Shojiro Nishio, "Broadcast Scheduling of Correlated Data Considering Access Frequency in Push-Based Systems," In Proc. of IASTED International Conference on Advances in Communications (AIC2001), pages 150-155 July 2001.