Hamid Mcheick Hafedh Mili Eric Dallaire Rakan Mcheik Delegation model for object-oriented systems. 899-902 2008 AICCSA http://dx.doi.org/10.1109/AICCSA.2008.4493638 conf/aiccsa/2008 db/conf/aiccsa/aiccsa2008.html#McheickMDM08