A controlled experiment on inheritance depth as a cost factor for code maintenance.

Lutz Prechelt Barbara Unger Michael Philippsen Walter F. Tichy A controlled experiment on inheritance depth as a cost factor for code maintenance. 115-126 2003 65 Journal of Systems and Software 2 http://dx.doi.org/10.1016/S0164-1212(02)00053-5 db/journals/jss/jss65.html#PrecheltUPT03