M.J. McDonnell, "Box-filtering techniques," Computer Graphics and Image Processing, vol. 17, pp. 65-70, 1981.

Changming Sun, "A Fast Stereo Matching Method," http://www.dms.csiro.au/~changs/stereo/matching-dicta97a/matching-dicta97a.html

Rolf D. Henkel, "Stereovision by Coherece-Detection," http://axon.physik.uni-bremen.de/research/stereo/tyc/node1.html
Also, check out his web-site which has some on-line stereo processing!