Paolo Tonella Giuliano Antoniol Roberto Fiutem Ettore Merlo Variable-precision reaching definitions analysis. 117-142 1999 11 Journal of Software Maintenance 2 http://dx.doi.org/10.1002/(SICI)1096-908X(199903/04)11:2<117::AID-SMR185>3.0.CO;2-P db/journals/smr/smr11.html#TonellaAFM99