Mardin, Farid, and Rommert Dekker. 2016. “Simultaneous Optimization of Block Replacement and Spare Part Ordering Time for a Multi Component System With Separate Spare Part Ordering for Block and Failure Replacements”. Journal of Engineering and Technological Sciences 48 (5):495-522. https://doi.org/10.5614/j.eng.technol.sci.2016.48.5.1.