@article{10_4064_am36_2_2,
     author = {E. M. Shokry and A. N. Ahmed and E. A. Rakha and H. M. Hewedi},
     title = {New results on the {NBUFR} and {NBUE
} classes of life distributions},
     journal = {Applicationes Mathematicae},
     pages = {139--147},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {2009},
     doi = {10.4064/am36-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am36-2-2/}
}