Cross Product Algebras references Can someone give some references to introductory books or online notes about group algebras and cross-product algebras ?
I've already searched on Google (but only for some online notes). The purpose of this request is just to self-learning, so I'd like something at the level of an introduction, if possible with comprehensive proves of the results.
Thanks in advance :)

Possibly a book with a more algebraic flavor and introductory level is the book by Cesar Polcino "an introduction to group rings" or the classic Don Passman book "the algebraic structure of group rings" where the crossed products are studied with some depth.
