Spirakis, Paul G. Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Tsigas, Philippas Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Kirousis, L., Spirakis, P. G., & Tsigas, P. (1996). Simple Atomic Snapshots: A Linear Complexity Solution with Unbounded Time-Stamps. Information Processing Letters, 58(5), 47-53.