@article{10_37236_2002,
     author = {George E. Andrews},
     title = {Concave compositions},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {2},
     doi = {10.37236/2002},
     zbl = {1229.05029},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2002/}
}