Peisen Zhang Huitao Sheng Alfredo Morabia T. Conrad Gilliam Optimal Step Length EM Algorithm (OSLEM) for the estimation of haplotype frequency and its application in lipoprotein lipase genotyping. 3 2003 4 BMC Bioinformatics http://dx.doi.org/10.1186/1471-2105-4-3 db/journals/bmcbi/bmcbi4.html#ZhangSMG03