@article{10_1017_S0017089506003302,
     author = {CROSSLEY, M. D.},
     title = {SOME {HOPF} {ALGEBRAS} {OF} {WORDS}},
     journal = {Glasgow mathematical journal},
     pages = {575--582},
     year = {2006},
     volume = {48},
     number = {3},
     doi = {10.1017/S0017089506003302},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089506003302/}
}