Iman Atighi and  Jalal Soleimannejad and  Ahmad Akbarinasab and  Saeid Moradpour,  Providing a Practical Model to Reduce Maintenance Costs: A Case Study in Golgohar Company.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2019, vol. 155(11). 1457 - 1460
    [viewed 17 February 2020]. Available from: https://publications.waset.org/pdf/10010914.