Bente Anda Hege Dreiem Dag I. K. Sjøberg Magne Jørgensen Estimating Software Development Effort Based on Use Cases-Experiences from Industry. 487-502 2001 conf/uml/2001 UML http://link.springer.de/link/service/series/0558/bibs/2185/21850487.htm db/conf/uml/uml2001.html#AndaDSJ01