@techreport{NS:FB96NR7,
author = {Ilkka Niemel{\"a} and P. Simons},
institution = {Universit{\"a}t Koblenz-Landau},
note = {Available at \url{http://www.uni-koblenz.de/fb4/publikationen/gelbereihe/}},
number = {7--96},
title = {Efficient Implementation of the Well-founded and Stable Model Semantics},
type = {Fach\-be\-richt Informatik},
year = {1996},
}