@article{JAC_1998__8_3_a0,
     author = {Ehrenborg, Richard and Readdy, Margaret},
     title = {Coproducts and the cd-index},
     journal = {Journal of Algebraic Combinatorics},
     pages = {273--299},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1998__8_3_a0/}
}