@article{MET_1984__31_175973,
     author = {M. Ahsanullah},
     title = {A {Characterization} of the {Exponential} {Distribution} by {Higher} {Gap.}},
     journal = {Metrika},
     pages = {323--326},
     publisher = {mathdoc},
     volume = {31},
     year = {1984},
     zbl = {0576.62019},
     url = {http://geodesic.mathdoc.fr/item/MET_1984__31_175973/}
}