[1] Murchland, J. (1975). Fundamental concepts and relations for reliability analysis of multi state systems reliability and fault tree analysis, in reliability and fault tree analysis, eds. R. Bartow, J. Fussell, and N. Singpurwalla, Philadelphia: SIAM, pp. 581–618.
[2] Ushakov I.(1986). Universal generating function, Soviet J. Comput. Systems Sci, 24(5):118–29.
[3] Ding Y, Lisniaski A.( 2008). Fuzzy universal generating function for multi-state system reliability assessment. Fuzzy Sets Syst,159:307–24
[4] Kuo, W., Wan, R. (2007). Recent advances in optimal reliability allocation. IEEE Trans Syst Man Cybern Part A: Syst Hum,37:143–56.
[5] Ouzineb M., Nourelfath, M., & Gendreau, M. (2008). Tabu search for the redundancy allocation problem of homogenous series–parallel multi-state systems. Reliab Eng Syst Saf, 93:1257–72.
[6] Li, Ch.Y., Chen, X., Yi, X.Sh., & Tao, J.Y. (2010). Heterogeneous redundancy optimization for multi-state series–parallel systems subject to common cause failures. Reliability Engineering and System Safety, 95:202–207.
[7] Sharma,V.K., Agarwal, M., & Sen, K. (2011). Reliability evaluation and optimal design in heterogeneous multi-state series-parallel systems. Information Sciences, 181:362–378.
[8] Hsieh, T.J.,Yeh, W.Ch. (2012). Penalty guided bees search for redundancy allocation problems with a mix of components in series–parallel systems. Computers & Operations Research, 39:2688–2704.
[9] Zoulfaghari, H., Hamadani, A.Z., & AboueiArdakan, M. (2013). Bi-objective redundancy allocation problem for a system with mixed repairable and non-repairable components. ISA Transactions, pp.1-8.
[10] Garg, H., Sharma, S.P.(2013). Multi-objective reliability-redundancy allocation problem using particle swarm optimization. Computers & Industrial Engineering, Vol. 64, pp. 247–255.
[11] Ardakan, M. A., Hamadani, A. Z., & Alinaghian, M. (2015). Optimizing bi-objective redundancy allocation problem with a mixed redundancy strategy. ISA transactions, 55, 116-128.
[12] Abouei Ardakan, M., Sima, M., & Zeinal Hamadani,
A., & Coit, D. W. (2016). A novel strategy for redundant components in reliability--redundancy allocation problems. IIE Transactions, 48(11), 1043-1057.
[13] Ardakan, M. A., & Hamadani, A. Z. (2014). Reliability optimization of series–parallel systems with mixed redundancy strategy in subsystems. Reliability Engineering & System Safety, 130,132-139.
[14] Kim, H., & Kim, P. (2017). Reliability–redundancy allocation problem considering optimal redundancy strategy using parallel genetic algorithm. Reliability Engineering & System Safety, 159, 153-160.
[15] Abouei Ardakan, M., Rezvan, M. T. (2017). Multi objective optimization of reliability-redundancy allocation
problem with cold-standby strategy using NSGA-II. Reliability Engineering & System Safety.
[16] Hadipour, H., Amiri, M., & Sharifi, M. (2018). Redundancy allocation in series-parallel systems under