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no DOI — not checkedChristofides N (1975) Graph theory. An algorithmic approach. Academic, New York
no DOI — not checkedCinlar E (1975) Introduction to stochastic processes. Prentice Hall, New York
no DOI — not checkedD'Amico G, Janssen J, Manca R (2005) Starting and ending backward and forward non-homogeneous semi-Markov recurrence time processes. In: Proceedings of the XXIX AMASES, Palermo
no DOI — not checkedIsaacson DL, Madsen RW (1976) Markov chains. Theory and applications. Wiley Series in Probability and Mathematical Statistics. Wiley, New York
no DOI — not checkedJanssen J, Manca R (2006) Applied semi-Markov processes. Springer, New York
no DOI — not checkedSonin I (1990) The asymptotic behaviour of a general finite nonhomogeneous Markov chain (the decomposition-separation theorem). Statistics, Probability and Game Theory. IMS Lecture Notes — Monograph Series, vol 30, 337–346
no DOI — not checkedTewarson RP (1973) Sparse matrices. Academic, London
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