Hu, l., Yue, D. and Li, J. (2012) Availability Analysis and Design Optimization for a Repairable Series-Parallel System with Dependencies, International Journal of Innovative Computing, Information and Control, 8, 6693-6705.
 Khatab, A., Nahas, N. and Nourelfath, M. (2009) Availbilty of K-Out-of-N: G Systems with Non-Identical Components Subject to Repair Priorities. Reliability Engineering & System Safety, 94, 142-151.
 Juang, Y.-S., Lin, S.-S. and Kao, H.-P. (2008) A Knowledge Management System for Series-Parallel Availability Optimization and Design. Expert Systems with Applications, 34, 181-193.
 Levitin, G. (2002) Optimal Series-Parallel Topology of Multi-State System with Two Failure Modes. Reliability Engineering & System Safety, 77, 93-107.
 Li, C.Y., Chen, X., Yi, X.S. and 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.
 Wang, S. and Wadata, J. (2009) Reliability Optimization of a Series-Parallel System with Fuzzy Random Lifetimes. International Journal of Innovative Computing, Information and Control, 5, 1547-1558.
 Wang, K.H. and Chen, Y.J. (2009) Comparative Analysis of Availability between Three Systems with General Repair Times, Reboot Delay and Switching Failures. Applied Mathematics and Computation, 215, 384-394.
 Wang, K.-H., Yen, T.-C. and Fang, Y.-C. (2012) Comparison of Availability between Two Systems with Warm Standby Units and Different Imperfect Coverage. Quality Technology and Quantitative Management, 9, 265-282.