Trade-offs in modern parenting: a longitudinal study of sibling competition for parental care

David W. Lawson, Ruth Mace
  • Evolution and Human Behavior, May 2009, Elsevier
  • DOI: 10.1016/j.evolhumbehav.2008.12.001

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http://dx.doi.org/10.1016/j.evolhumbehav.2008.12.001