You could try one or all of these (same authors):

**Dan Edidin and William Graham:** 
  
*Algebraic cycles and completions of equivariant K-theory*
[here][1]

*Riemann-Roch for equivariant Chow groups*
[here][2]

*Equivariant intersection theory*
[here][3]


  [1]: https://projecteuclid.org/journals/duke-mathematical-journal/volume-144/issue-3/Algebraic-cycles-and-completions-of-equivariant-K-theory/10.1215/00127094-2008-042.short
  [2]: https://projecteuclid.org/journals/duke-mathematical-journal/volume-102/issue-3/Riemann-Roch-for-equivariant-Chow-groups/10.1215/S0012-7094-00-10239-6.short
  [3]: http://www.springerlink.com/content/0txg8xuq8ydqh7uj/