@article{MET_1983__30_175904,
     author = {H. Vogt},
     title = {Unimodality of {Differences.}},
     journal = {Metrika},
     pages = {165--170},
     year = {1983},
     volume = {30},
     zbl = {0521.60015},
     url = {http://geodesic.mathdoc.fr/item/MET_1983__30_175904/}
}