Anthony Tomasic Luis Gravano Calvin Lue Peter M. Schwarz Laura M. Haas Data Structures for Efficient Broker Implementation. 223-253 1997 15 ACM Trans. Inf. Syst. 3 db/journals/tois/tois15.html#TomasicGLSH97 http://doi.acm.org/10.1145/256163.256165