We review recent progress in the study of cyclic cohomology of Hopf algebras, extended Hopf algebras, invariant cyclic homology, and Hopf-cyclic homology with coefficients, starting with the pioneering work of Connes-Moscovici.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-bc61-0-5, author = {M. Khalkhali and B. Rangipour}, title = {Cyclic cohomology of (extended) Hopf algebras}, journal = {Banach Center Publications}, volume = {60}, year = {2003}, pages = {59-89}, zbl = {1100.19001}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc61-0-5} }
M. Khalkhali; B. Rangipour. Cyclic cohomology of (extended) Hopf algebras. Banach Center Publications, Tome 60 (2003) pp. 59-89. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc61-0-5/