Yannis E. Ioannidis Boris Novikov Boris Rachev Advances in Databases and Information Systems, 11th East European Conference, ADBIS 2007, Varna, Bulgaria, September 29-October 3, 2007, Proceedings ADBIS Lecture Notes in Computer Science 4690 Springer 2007 978-3-540-75184-7 db/conf/adbis/adbis2007.html