Proc. of the 6th Italian Symp. on Advanced Database Systems (SEBD 1998). 1998.
@inproceedings{SEBD-1998, title = "Extending Semi-Structured Data", year = "1998", author = "Diego Calvanese and De Giacomo, Giuseppe and Maurizio Lenzerini", booktitle = "Proc. of the 6th Italian Symp. on Advanced Database Systems (SEBD 1998)", }