An Aspect of Query Optimization in Multidatabase Systems (Extended Abstract).

http://doi.acm.org/10.1145/211990.212011 Chiang Lee Chia-Jung Chen Hongjun Lu An Aspect of Query Optimization in Multidatabase Systems (Extended Abstract). 28-33 sigmodR/24-3/P028.pdf 1995 24 SIGMOD Record 3 db/journals/sigmod/sigmod24.html#LeeCL95