M. P. Papa G. Ragucci G. Corrente F. Ferrise S. Giurleo D. Vitale The Development of an Object-Oriented Multimedia Information System. 278-297 1994 conf/isooms/1994 ISOOMS db/conf/isooms/isooms94.html#PapaRCFGV94 http://dx.doi.org/10.1007/BFb0014031