1. A note on two problems in connexion with graphs
2. P. Sanders, D. Schultes, in Algorithms: ESA 2006, 14th European Symposium on Algorithms (ESA), Zurich, Switzerland, 11 to 13 September 2006 (vol. 4168 of Lecture Notes in Computer Science, Springer, Berlin, 2006), pp. 804–816.
3. More details can be found at http://algo2.iti.uka.de/schultes/hwy/.
4. This work was partially supported by Deutsche Forschungsgemeinschaft grant SA 933/1-3.