Wolfgang Emmerich Ernst Ellmer Henry Fieglein 567-576 2001 conf/icse/2001 ICSE db/conf/icse/icse2001.html#EmmerichEF01 https://doi.org/10.1109/ICSE.2001.919131 https://doi.ieeecomputersociety.org/10.1109/ICSE.2001.919131