عبودع, عبدف. Eatimation Availability Function Through Determination The Optimal Imperfect Preventive Maintenance Period By using Simulation. JEAS [Internet]. 1Dec.2012 [cited 30Nov.2019];18(69):263. Available from: http://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/927