Estimating divergence time and ancestral effective population size of Bornean and Sumatran orangutan subspecies using a coalescent hidden Markov model.
Mailund T, Dutheil J Y, Hobolth A, Lunter G, Schierup M H (2011); PLoS Genet., 7(3):e1001319. doi: 10.1371/journal.pgen.1001319