I am starting to study Le Gall's equivariant KK-theory and twisted equivariant KK-theory. Does anyone knows a good reference on this subject? By the way, I can not access to Journal of K-theory and where can I find the following articles?

Jérôme Chabert and Siegfried Echterhoff: Twisted Equivariant KK-Theory and the Baum–Connes Conjecture for Group Extensions K-theory 23 (2001), 157-200

Le Gall, P. Y.: Théorie de Kasparov équivariante et groupoïdes. I. K-Theory 16 (1999), no. 4, 361-390