Fatemeh Afsharnia and Mohammad Amin Asoodar and Abbas Abdeshahi, The Effect of Failure Rate on Repair and Maintenance Costs of Four Agricultural Tractor Models. journal = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology. March 2014, vol. 87(3). 286 - 290 [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/9997982.