@Unpublished{K-theory/0812,
  author = 	 {{Helena B. Fischbacher-Weitz  and Bernhard Koeck }},
  title = 	 {{Equivariant Riemann-Roch theorems for curves over perfect fields }},
  note = 	 {{Preprint, January 9, 2007, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0812/}}}
}