Kopp, V.,  Zamoryonov, M., Chalenkov, N. and Skatkov, I. 2020. Phase Enlargement of Semi-Markov Systems without Determining Stationary Distribution of Embedded Markov Chain. SPIIRAS Proceedings. 19, 3 (Jun. 2020), 539-563. DOI:https://doi.org/10.15622/sp.2020.19.3.3.