@article{JAC_2001__13_3_a4,
     author = {Gebhard, David D. and Sagan, Bruce E.},
     title = {A chromatic symmetric function in noncommuting variables},
     journal = {Journal of Algebraic Combinatorics},
     pages = {227--255},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2001__13_3_a4/}
}