References
- Kuznecov V.N. Turbin A.F. Caturan G.G. Semi-Markov models of recoverably systems, Kiev:Institut Matematiki Akademii Nauk UkrSSR pre-print 81. 11 Institute of mathematics of the Academy of Sciences of the Ukrainian SSR) Russian 1981
- Koroluk , V.S. and Turbin , A.F. Processes of Markov's recoverability in reliability systems tasks , Kiev : Naukova Dumka . in Russian