Imed Hammouda Maarit Harsu Documenting Maintenance Tasks Using Maintenance Patterns. 37-47 2004 conf/csmr/2004 CSMR http://csdl.computer.org/comp/proceedings/csmr/2004/2107/00/21070037abs.htm db/conf/csmr/csmr2004.html#HammoudaH04