1. Ferreira F, Pacheco A (2007) Comparison of level-crossing times for Markov and semi-Markov processes. Stat Probab Lett 77(2):151–157
2. Glynn PW, Haas PJ (2006) Laws of large numbers and functional central limit theorems for generalized semi-Markov processes. Stoch Model 22(2):201–231
3. Grabski F (2002) Semi-Markov models of systems reliability and operations analysis. System Research Institute, Polish Academy of Science (in Polish)
4. Kołowrocki K (2005) Reliability of large systems. Elsevier Amsterdam—Boston—Heidelberg—London—New York—Oxford—Paris—San Diego—San Francisco—Singapore—Sydney—Tokyo
5. Kołowrocki K (2014) Reliability of large and complex systems (2nd edn), Elsevier Amsterdam—Boston—Heidelberg—London—New York—Oxford—Paris—San Diego—San Francisco—Singapore—Sydney—Tokyo