@article{05903054, title = {Concave compositions.}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {18}, year = {2011}, zbl = {1229.05029}, language = {en}, url = {http://dml.mathdoc.fr/item/05903054} }
Andrews, George E. Concave compositions.. The Electronic Journal of Combinatorics [electronic only], Tome 18 (2011) . http://gdmltest.u-ga.fr/item/05903054/