@article{JAC_2008__28_1_a8,
     author = {Crapo, Henry and Schmitt, William},
     title = {Primitive elements in the matroid-minor {Hopf} algebra},
     journal = {Journal of Algebraic Combinatorics},
     pages = {43--64},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2008__28_1_a8/}
}