@article{MET_1972__19_175551,
     author = {D.K. Kulshrestha},
     title = {Reliability with {Preventive} {Maintenance.}},
     journal = {Metrika},
     pages = {216--226},
     publisher = {mathdoc},
     volume = {19},
     year = {1972},
     zbl = {0253.90021},
     url = {http://geodesic.mathdoc.fr/item/MET_1972__19_175551/}
}