Zhao (2004), “2LD, GENECOUNTING and HAP: computer programs for linkage disequilibrium analysis”, Bioinformatics, 20(8):1325-1326.
Zapata, Carollo, Rodriguez (2001), “Sampling variance and distribution of the D’ measure of overall gametic disequlibrium between multiallelic loci”, Annals of Human Genetics, 65:395-406.