@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/