1. Secular growth changes;Van Wieringen,1986
2. Secular Trends in Human Growth, Maturation and Development,1979
3. Secular changes in size and maturity: causes and effects;Malina,1979
4. The secular trend towards earlier physical maturation;Tanner;T. Soc. Geneesk.,1986
5. Exogamie et heterosis;Hulse;Arch. Suisses Anthrop. Gen.,1957