@article{10_37236_2258,
     author = {Richard P. Stanley and Fabrizio Zanello},
     title = {On the rank function of a differential poset},
     journal = {The electronic journal of combinatorics},
     year = {2012},
     volume = {19},
     number = {2},
     doi = {10.37236/2258},
     zbl = {1253.06003},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2258/}
}