@article{10_37236_291,
     author = {Toufik Mansour and Mark Shattuck and Sherry H.F. Yan},
     title = {Counting subwords in a partition of a set},
     journal = {The electronic journal of combinatorics},
     year = {2010},
     volume = {17},
     doi = {10.37236/291},
     zbl = {1193.05025},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/291/}
}