Anssi Karhinen Marco Sandrini Juha O. Tuominen An Approach to Manage Variance in Legacy Systems. 190-193 1999 conf/csmr/1999 CSMR http://csdl.computer.org/comp/proceedings/csmr/1999/0090/00/00900190abs.htm db/conf/csmr/csmr1999.html#KarhinenST99