[ABS03]

M. Aguiar, N. Bergeron, and F. Sottile, Combinatorial Hopf algebras and generalized
DehnSommerville relations,
In preparation, 2003.

[AS02]

M. Aguiar and F. Sottile, Structure of the
MalvenutoReutenauer Hopf Algebra of Permutations,
math.CO/0203282.

[AS03]

,
Structure of the
LodayRonco Hopf Algebra of Planar Binary Trees,
In preparation, 2003.
