1. Arkin, E.M., Bender, M.A., Fekete, S.P., Mitchell, J.S.B., Skutella, M.: The freezetag problem: How to wake up a swarm of robots. In: Proc. 13th ACM-SIAM Symp. on Discrete Algorithms, pp. 568–577 (2002)
2. Arkin, E.M., Bender, M.A., Ge, D., He, S., Mitchell, J.S.B.: Improved Approximation Algorithms for the Freeze-Tag Problem. In: Proc. 15th Annual ACM Symposium on Parallel Algorithms and Architectures, pp. 295–303 (2003)
3. Borodin, A., El-Yaniv, R.: Online Computation and Competitive Analysis. Cambridge University Press, Cambridge (1998)
4. Koutsoupias, E., Papadimitriou, C.H.: On the k-server conjecture. Journal of the ACM 42(5), 971–983 (1995)
5. Manasse, M., McGeoch, L.A., Sleator, D.: Competitive algorithms for server problems. Journal of Algorithms 11, 208–230 (1990)