Louigi Addario-Berry Benny Chor Michael T. Hallett Jens Lagergren Alessandro Panconesi Todd Wareham Ancestral Maximum Likelihood of Evolutionary Trees Is Hard. 257-272 2004 2 J. Bioinformatics and Computational Biology 2 http://dx.doi.org/10.1142/S0219720004000557 db/journals/jbcb/jbcb2.html#Addario-BerryCHLPW04