M. Halling, S. Biffl, P. Grünbacher:
"The Role of Valuation in Value-Based Software Engineering";
in: "6th International Workshop on Economics-Driven Software Engineering Research Proceedings", issued by: icse conference series; IEE, 2004, ISBN: 0-86341-424-9, 7 - 10.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04968451