Bjelde, A., Disser, Y., Hackfeld, J., Hansknecht, C., Lipmann, M., Meißner, J., Schewior, K., Schlöter, M. and Stougie, L.
Tight bounds for online TSP on the line.
In Proceedings of the Symposium on Discrete Algorithms (SODA), pp. 994–1005, 2017. [pdf]