@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/