Bibliography (12):

1. The relationship of major diseases with childlessness: a sibling matched case-control and population register study in Finland and Sweden

2. Life-course socioeconomic differences and social mobility in preventable and non-preventable mortality: a study of Swedish twins

3. Older fathers’ children have lower evolutionary fitness across four centuries and in four populations

4. A Nation-Wide Swedish Cohort Study on Early Maternal Age at First Childbirth and Risk for Offspring Deaths, Accidents, and Suicide Attempts

5. Sexual dimorphism in the genetic influence on human childlessness

6. Contemporary selection pressures in modern societies? Which factors best explain variance in human reproduction and mating?

7. Physical attractiveness and reproductive success in humans: Evidence from the late 20^th century United States

8. Familial risk and heritability of intellectual disability: a population-based cohort study in Sweden

9. High consanguinity promotes intergenerational wealth concentration in socioeconomically privileged Krummhörn families of the 18^th and 19^th centuries

10. Assortative mating and differential fertility by phenotype and genotype across the 20^th century

11. Wikipedia Bibliography:

    1. https://en.wikipedia.org/wiki/Sweden  :

       https://en.wikipedia.org/wiki/Sweden

    2. https://en.wikipedia.org/wiki/Skellefte%C3%A5  :

       https://en.wikipedia.org/wiki/Skellefte%C3%A5