Oktay,F. Beria, and Elmastas Gultekin,Ö. . "Combined Markov and UGF Methods for Multi-State Repairable Phased Mission Systems", International Journal of Reliability, Risk and Safety: Theory and Application, 6, 1, 2023, 1-9. doi: 10.22034/IJRRS.2023.6.1.1