Atef Bader Shangping Ren Husein Armouti Delta Changes for OO Software Adaptation: Pervasive or Invasive? 2005 conf/hicss/2005 HICSS http://doi.ieeecomputersociety.org/10.1109/HICSS.2005.188 db/conf/hicss/hicss2005-9.html#BaderRA05