@inproceedings{inproceedingse137a4c4,
title   = {iDFQL: a query-based tool to help the teching process of the relational algebra},
author = {Appel, Ana Paula and Silva, Elaine Quintino da and Traina Junior, Caetano and Traina, Agma Juci Machado},
year = {2004},
booktitle   = {World Congress on Engineering and Technology Education}
}