Oriented Chow groups, Hermitian K-theory and the Gersten conjecture, by Jens Hornbostel: http://www.math.uiuc.edu/K-theory/0835
arXiv: Experimental full text search
AG (Algebraic geometry)
Later, Witt
This is the same as Chow-Witt groups
Key authors: Hornbostel, Fasel, Srinivas, maybe Calmes, maybe Roendigs.
nLab page on Oriented Chow groups