@article{10_1090_S0894_0347_1988_0941434_9,
     author = {Stanley, Richard P.},
     title = {Differential posets},
     journal = {Journal of the American Mathematical Society},
     pages = {919--961},
     publisher = {mathdoc},
     volume = {01},
     number = {4},
     year = {1988},
     doi = {10.1090/S0894-0347-1988-0941434-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1988-0941434-9/}
}