Cilanne Boulet Igor Pak A combinatorial proof of the Rogers-Ramanujan and Schur identities. 1019-1030 2006 113 J. Comb. Theory, Ser. A 6 http://dx.doi.org/10.1016/j.jcta.2005.09.007 db/journals/jct/jcta113.html#BouletP06