article{entcs03,
        title = {{A Safe Relational Calculus for Functional 
                 Logic Deductive Databases}},
        author = {J. M. {Almendros-Jim\'enez} and A. {Becerra-Ter\'on}},
        year = {2003},
        journal = {Electronic Notes in Theoretical Computer Science, ENTCS},
        volume = {86},
        number = {3},
        pages = {37},
}