@article{10_37236_1264,
     author = {Richard P. Stanley},
     title = {Flag-symmetric and locally rank-symmetric partially ordered sets},
     journal = {The electronic journal of combinatorics},
     year = {1996},
     volume = {3},
     number = {2},
     doi = {10.37236/1264},
     zbl = {0857.05091},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1264/}
}