@Inproceedings{Pardavilla96,
author = {Pardavilla, M. and Brisaboa, N. R.},
title = {QBE para Datalog},
booktitle = {Actas de las I Jornadas de InvestigaciĆ³n y Docencia en Bases de Datos (JIDBD'96)},
address = {A CoruƱa},
year = {1996},
pages = {142-150}
}