1. Aguiar, M. (2000). Infinitesimal Hopf Algebras, Contemporary Mathematics, New Trends in Hopf Algebra Theory (La Falda, 1999), Contemporary Mathematics 267. Providence, RI: Amer. Math. Soc., pp. 1–29.
2. On the Associative Analog of Lie Bialgebras
3. Infinitesimal Hopf Algebras and the cd-Index of Polytopes
4. Aguiar, M. (2004). Infinitesimal Bialgebras, Pre-Lie and Dendriform Algebras. Hopf Algebras, Lecture Notes in Pure and Applied Mathematics, Vol. 237. New York, NY: Dekker, pp. 1–33.