@inproceedings{Renda06, author = "Renda, M. Elena and Straccia, Umberto", title = "Automatic Structured Query Transformation Over Distributed Digital Libraries", booktitle = "Proceedings of the 21st Annual ACM Symposium on Applied Computing (SAC-06)", publisher = "ACM", address = "Dijon, France", pages = "1078--1083", year = "2006" }