1. Recognizing tough graphs is NP-hard;D Bauer;Discrete Appl. Math,1990
2. Some recent results on long cycles in tough graphs;D Bauer;Proceedings of 6th International Conference on the Theory and Applications of Graphs,1991
3. Long cycles in graphs with prescribed toughness and minimum degree;D Bauer;Discrete Math,1995
4. Cycles in tough graphs updating the last 4 years;D Bauer;Graph Theory, Combinatorics, and Applications: Proceeding of the Seventh Quadrennial International Conference on the Theory and Applications of Graphs,1995
5. Progress on tough graphs another four years;D Bauer;Combinatorica,1999