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Lawler RR, (2009) Monogamy, monomorphism, and mechanisms of sexual dimorphism. Journal of Human Evolution 57: 321-325.
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Lawler RR (2007) Fitness and extra-group reproduction in male Verreaux’s sifaka (Propithecus verreauxi verreauxi). American Journal of Physical Anthropology 132: 267-27
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Lawler RR, Richard AF, Riley MA (2003) Genetic population structure of the white sifaka (Propithecus verreauxi verreauxi) in southwest Madagascar. Molecular Ecology 12: 2307-2317.