V. Clayton

Erikson's theory of human development as it applies to the aged: wisdom as contradictive cognition.

V. Clayton, 1975, Human development.

Wisdom and Intelligence: The Nature and Function of Knowledge in the Later Years

Vivian Clayton, V. Clayton, 1983, International journal of aging & human development.

Fluid and crystallized intelligence in young adulthood and old age.

W R Cunningham, V Clayton, W Overton, 1975, Journal of gerontology.