Seyedvahid Najafi and Viliam Makis, Comparison of Two Maintenance Policies for a Two-Unit Series System Considering General Repair. journal = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2020, vol. 168(12). 618 - 623 [viewed 21 September 2024]. Available from: https://publications.waset.org/pdf/10011680.