Zeynab Allahkarami Ahmad Reza Sayadi Behzad Ghodrati Identifying the mixed effects of unobserved and observed risk factors on the reliability of mining hauling system. 281-289 2021 12 Int. J. Syst. Assur. Eng. Manag. 2 https://doi.org/10.1007/s13198-021-01073-3 db/journals/saem/saem12.html#AllahkaramiSG21