Hiromitsu Shimakawa George Ido Hideyuki Takada Yoshitomo Asano Morikazu Takegaki Active Transactions Integrated with Real-Time Transactions According to Data Freshness. 49-59 1997 conf/rtas/1997 IEEE Real Time Technology and Applications Symposium http://computer.org/proceedings/rtas/8016/80160049abs.htm db/conf/rtas/rtas1997.html#ShimakawaITAT97