[1]
Böckenhauer, H.-J., Forlizzi, L., Hromkovic, J., Kneis, J., Kupke, J., Proietti, G. and Widmayer, P. 2007. On the Approximability of TSP on Local Modifications of Optimally Solved Instances. Algorithmic Operations Research. 2, 2 (Sep. 2007), 83.