Tamar Barzuza Jacques S. Beckmann Ron Shamir Itsik Pe'er Computational Problems in Perfect Phylogeny Haplotyping: Xor-Genotypes and Tag SNPs. 14-31 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3109&spage=14 2004 conf/cpm/2004 CPM db/conf/cpm/cpm2004.html#BarzuzaBSP04