Hawkes, K Grandmothering, menopause, and the evolution of human life histories. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Feb 1998 - 1336-9 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.95.3.1336 doi Subjects--Topical Terms: AnimalsBiological EvolutionFamily CharacteristicsFemaleHumansLongevity--physiologyModels, PsychologicalMother-Child RelationsPostmenopause--physiology