Neal, R. M. (2005) ``Estimating ratios of normalizing constants using Linked Importance Sampling'', Technical Report No. 0511, Dept. of Statistics, University of Toronto, 37 pages: abstract, postscript, pdf.The program is written in R (see the R project web site). Some aspects of how it was used depend on Unix/Linux
First (and probably only) release of 8 November 2005: TAR archive.