RELFUN Guide: Programming with Relations and Functions Made Easy

@techreport{pub5906,
    author = {Boley, Harold and Elsbernd, Klaus and Herfert, Michael and Sintek, Michael and Stein, Werner},
    title = {RELFUN Guide: Programming with Relations and Functions Made Easy},
    series = {DFKI Documents (D)},
    year = {1993},
    volume = {93-12},
    pages = {86},
    institution = {DFKI},
    note = {The current version is the Second Revised Edition of July 1996}
}