1. Aakster CW, Jaszmann LJB (1980) A medico-psychosociological epidemiologic survey of the middle-aged Dutch woman (in Dutch). Praeventiefonds Report. The Hague
2. Brand PC (1978) Age at menopause. Ph D thesis, Utrecht
3. Burch JC, Byrd BF, Vaughn WK (1975) The effect of “long-term” estrogen administration to women following hysterectomy. In: Van Keep PA, Lauritzen C (eds) Estrogens in the post-menopause. Karger, Basel, pp 208–212
4. Burch PRJ, Gunz FW (1967) The distribution of menopausal age in New Zealand. An exploratory study. NZ Med J 66:6–10
5. Butler N, Bonham D (1963) Perinatal mortality. Livingstone, London