@article{05769880,
title = {Counting peaks and valleys in a partition of a set.},
journal = {Journal of Integer Sequences [electronic only]},
volume = {13},
year = {2010},
zbl = {1205.05016},
language = {en},
url = {http://dml.mathdoc.fr/item/05769880}
}
Mansour, Toufik; Shattuck, Mark. Counting peaks and valleys in a partition of a set.. Journal of Integer Sequences [electronic only], Tome 13 (2010) . http://gdmltest.u-ga.fr/item/05769880/