1. Harmonic analysis on semisimple Hopf algebras;Andruskiewitsch;Algebra i Analiz,2000
2. Kernel of representations and coideal subalgebras for Hopf algebras;Burciu;Glasg. Math. J.,2012
3. Normal coideal subalgebras of semisimple Hopf algebras;Burciu;J. Phys. Conf. Ser.,2012
4. Methods of Representation Theory, Vol. I;Curtis,1990
5. Hit-invariants and commutators for Hopf algebras;Cohen;Bull. Math. Soc. Sci. Math. Roumanie,2013