WHO.
Environmental Health Criteria 221 Zinc. Geneva: World Health Organisation; 2001.
WHO.
Environmental Health Criteria 227: Fluorides. Geneva: World Health Organisation; 2002 p. pp 230.
WHO.
Environmental Health Criteria 61 Chromium. Geneva: World Health Organisation; 1988.
WHO.
Environmental Health Criteria 81 Vanadium. Geneva: World Health Organisation; 1988.