@article{10_4064_am30_3_2,
     author = {Erhard Cramer and Udo Kamps and Mohammad Z. Raqab},
     title = {Characterizations of exponential
 distributions by spacings of
 generalized order statistics},
     journal = {Applicationes Mathematicae},
     pages = {257--265},
     year = {2003},
     volume = {30},
     number = {3},
     doi = {10.4064/am30-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am30-3-2/}
}