@booklet {GyBF99, title = {An Efficient Relevant Slicing Method for Debugging}, year = {1999}, publisher = {Research Group on Artificial Intelligence, Hungarian Academy of Sciences and J{\'o}zsef Attila University}, author = {Tibor Gyim{\'o}thy and {\'A}rp{\'a}d Besz{\'e}des and I. Forg{\'a}cs} }