Estimating Software Project Effort Based on the Development Process Model. - Ursula Passing; Susanne Strahringer (Softwaretechnik-Trends, 2002)

An experiment on software project size and effort estimation. - Ursula Passing; Martin J. Shepperd (ISESE, 2003)

Prozessorientierte Expertenschätzungen in der Unternehmenspraxis. - Susanne Strahringer; Ursula Löbbert-Passing; Christian J. Schäfer; Ulrich Everling (HMD Prax. Wirtsch., 2007)