@string{JFP="J. Functional Programming"} @article{MuellerNvOS99, author= {Olaf M{\"u}ller and Tobias Nipkow and Oheimb, David von and Oskar Slotosch}, title={{HOLCF = HOL + LCF}},journal=JFP,year=1999,volume=9,pages={191--223}}