Albert Serra Nacho Navarro Toni Cortes DITools: Application-level Support for Dynamic Extension and Flexible Composition. 225-238 2000 conf/usenix/2000g USENIX Annual Technical Conference, General Track http://www.usenix.org/publications/library/proceedings/usenix2000/general/serra.html db/conf/usenix/usenix2000g.html#SerraNC00