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Journal Article Ego Strength and Happiness of the Aged Get access Paul Cameron, Ph.D. Paul Cameron, Ph.D. 1Stout State UniversityMenomonie, Wisconsin. Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Gerontology, Volume 22, Issue 2, April 1967, Pages 199–202, https://doi.org/10.1093/geronj/22.2.199 Published: 01 April 1967
Paul Cameron (Sat,) studied this question.