@ARTICLE{Samet_S._Repairable_2009,
 author={Samet, S. and Chelbi, A. and F. Hmida},
 volume={vol. 57},
 number={No 3},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={249-256},
 howpublished={online},
 year={2009},
 title={Repairable systems availability optimization under imperfect maintenance},
 URL={http://journals.pan.pl/Content/105847/PDF/06_paper.pdf},
 doi={10.2478/v10175-010-0126-z},
}