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Fuzzy semi-Markovian stochastic model for single-unit system with repairman arrival delay under Lindley lifetime distribution using bell-shaped membership function. J. Nig. Soc. Phys. Sci. [Internet]. 2026 Jun. 29 [cited 2026 Jun. 29];8(3):3438. Available from: https://journal.nsps.org.ng/index.php/jnsps/article/view/3438