In that time the Bislett Games was part of the IAAF Grand Prix, Golden Four, Golden League and now Diamond League.
As listed above, several papers have been published that describe the internal structure of reac TIVision and libfidtrack in great detail.
If you are interested in purchasing a Reactable you can find further information at : reac TIVision 1.5.1 is a maintenance release which provides several bug fixes and updated builds for all platforms, also introducing a 64bit build and other significant improvements for Windows systems.
For Mac OS X it is recommended to use the 64bit build for Mac OS X 10.8 or later, which provides better performance and camera support.
A quick and dirty shape matching algorithm selects the actual finger blobs from the possible region candidates.
A complementary blob tracking algorithm is also taking advantage of the same data in order to track eventually not recognized fiducials, for example where fast movements destroy the actual fiducial structure in the image.