B. Hofreiter, C. Huemer, W. Winiwarter:
"OCL-Constraints for UMM Business Collaborations";
Vortrag: 5th International Conference on Electronic Commerce and Web Technologies: (EC-Web 2004), Zaragoza, Spain; 2004; in: "5th International Conference on Electronic Commerce and Web Technologies: (EC-Web 2004)", (2004).