1. Algorithmic Aspects of Flows in Networks;Ruhe,1991
2. On spanning tree problems with multiple objectives;Hamacher;Ann. Oper. Res.,1994
3. Kirner, T.G., et al. “InTec-SRE: innovative technologies for software requirements engineering”, 1995.
4. No improvement without feedback: experiences from goal-oriented measurement at Schlumberger;Van Latum,1996
5. Rough set-based data analysis in goal-oriented software measurement;Ruhe,1996