Alceu Heinke Frigeri Carlos Eduardo Pereira Wolfgang A. Halang An Object-Oriented Extension to PEARL90. 265-274 1998 conf/isorc/1998 ISORC http://doi.ieeecomputersociety.org/10.1109/ISORC.1998.666797 db/conf/isorc/isorc1998.html#FrigeriPH98