@article{10_1090_S0894_0347_01_00373_3,
     author = {Haiman, Mark},
     title = {Hilbert schemes, polygraphs and the {Macdonald} positivity conjecture},
     journal = {Journal of the American Mathematical Society},
     pages = {941--1006},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {2001},
     doi = {10.1090/S0894-0347-01-00373-3},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-01-00373-3/}
}