@article{10_37236_1359,
     author = {Mireille Bousquet-M\'elou},
     title = {Multi-static enumeration of two-stack sortable permutations},
     journal = {The electronic journal of combinatorics},
     year = {1998},
     volume = {5},
     doi = {10.37236/1359},
     zbl = {0890.05004},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1359/}
}