conf/vldb/98 Fernando de Ferreira Rezende Klaudia Hergula The Heterogeneity Problem and Middleware Technology: Experiences with and Performance of Database Gateways. 146-157 1998 VLDB db/conf/vldb/vldb98.html#RezendeH98 db/conf/vldb/RezendeH98.html VLDB98/p146.pdf ... conf/ac/Gray78 ... ... ... ... ... ... books/mk/Gray93