Esther M. Arkin, Michael A. Bender, Dongdong Ge. Improved approximation algorithms for the freeze-tag problem. In SPAA 2003: Proceedings of the Fifteenth Annual ACM Symposium on Parallel Algorithms, June 7-9, 2003, San Diego, California, USA (part of FCRC 2003). pages 295-303, ACM, 2003. [doi]
Abstract is missing.