@article{JAC_2000__11_1_a2,
     author = {Hoffman, Michael E.},
     title = {Quasi-shuffle products},
     journal = {Journal of Algebraic Combinatorics},
     pages = {49--68},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2000__11_1_a2/}
}