@article{05274238,
title = {Generalized Schr\"oder numbers and the rotation principle.},
journal = {Journal of Integer Sequences [electronic only]},
volume = {10},
year = {2007},
zbl = {1141.05301},
language = {en},
url = {http://dml.mathdoc.fr/item/05274238}
}
Schröder, Joachim. Generalized Schröder numbers and the rotation principle.. Journal of Integer Sequences [electronic only], Tome 10 (2007) . http://gdmltest.u-ga.fr/item/05274238/