@inproceedings{inproceedings1455c495,
title   = {Invariants of Hopf algebras on free algebras},
author = {Ferreira, Vitor de Oliveira and Murakami, Lúcia Satie Ikemoto},
year = {2006},
booktitle   = {Madrid ICM2006 Satellite Conference - Nocommutative Algebra}
}