Ito, K. and Nakagawa, T. (1992) Optimal Inspection Policies for a System in Storage. Computers and Mathematics with Applications, 24, 87-90.
 Ito, K., Nakagawa, T. and Nishi, K. (1995) Extended Optimal Inspection Policies for a System in Storage. Mathematical and Computer Modelling, 22, 83-78.
 Yun, W.Y., Kim, H.W. and Han, Y.J. (2012) Simulation-Based Inspection Policies for a One-Shot System in Storage. Proceedings of the 5th Asia-Pacific International Symposium, Nanjing, 1-3 November 2012, 621-628.
 Yun, W.Y., Liu, K., Han, Y.J., Rhee, D.W. and Han, C.G. (2013) Simulation-Based Optimal Inspection Schedules for One-Shot Systems with Two Types of Units. Proceedings of 17th International Conference on Industrial Engineering Theory, Applications and Practice, Pusan, 6-9 October 2013, 314-320.
 Yun, W.Y., Zhao, Q. and Kim, H.W. (2014) Optimal Inspection Schedules for One-Shot Systems in Storage with Deployment Plan. Proceedings of the 6th Asia-Pacific International Symposium, Sapporo, 21-23 August, 578-585.