1. A. Kossakowski and R. Rebolledo, ‘‘On non-Markovian time evolution in open quantum systems,’’ Open Syst. Inform. Dyn. 14, 265–274 (2007).
2. H. P. Breuer, ‘‘Non-Markovian generalization of the Lindblad theory of open quantum systems,’’ Phys. Rev. A 75, 022103 (2007).
3. H. P. Breuer, E. M. Laine, and J. Piilo, ‘‘Measure for the degree of non-Markovian behavior of quantum processes in open systems,’’ Phys. Rev. Lett. 103, 210401 (2009).
4. N. Lo Gullo, I. Sinayskiy, T. Busch, and F. Petruccione, ‘‘Non-Markovianity criteria for open system dynamics,’’ arXiv:1401.1126 (2014).
5. A. Rivas, S. F. Huelga, and M. B. Plenio, ‘‘Quantum non-Markovianity: Characterization, quantification and detection,’’ Rep. Prog. Phys. 77, 094001 (2014).