@article {IOPORT.03723652,
    author       = {Murthy, D.N.P. and Nguyen, D.G.},
    title        = {Optimal age-policy with imperfect preventive maintenance.},
    year         = {1981},
    journal      = {IEEE Transactions on Reliability},
    volume       = {30},
    issn         = {0018-9529},
    pages        = {80-81},
    publisher    = {Institute of Electrical and Electronics Engineers (IEEE), Washington, DC},
    doi          = {10.1109/TR.1981.5220976},
    identifier   = {03723652},
}