Bergeron, N., Hohlweg, C., Rosas, M. and Zabrocki, M. 2006. Grothendieck Bialgebras, Partition Lattices, and Symmetric Functions in Noncommutative Variables. The Electronic Journal of Combinatorics. 13, 1 (Aug. 2006), R75. DOI:https://doi.org/10.37236/1101.