@inproceedings{ LÓPEZ,

author = { JAVIER LÓPEZ PEÑA } ,

title = { INVARIANCE UNDER TWISTING },

booktitle = { NEW TECHNIQUES IN HOPF ALGEBRAS AND GRADED RING THEORY () (.2006.BRUSELAS (BÉLGICA)) },

year = { 2006 },

pages = { None - None },

location = { BRUSELAS (BÉLGICA) },

}