1. Wong GP, Timothy L, Martin TR, Farquharson DF. Effects of low lead exposure in utero. Obstet Gynecol Surv. 1992;47(5):285–8.
2. Borschein RL, Succop PA, Dietrich KN, Clark CS, Que-Hee S, Hammond PB. The influence of social and economical factors on dust lead, hand lead and blood lead levels in young children. Environ Res. 1985;38(1):108–18.
3. Barton JC, Conrad ME, Harrison L, Nuby S. Effects of calcium on the absorption and retention of lead. J Lab Clin Med. 1978;91(3):366–76.
4. IPCS Environmental Health criteria 165, Inorganic Lead. WHO Publication. 1995. p. 147–154.
5. Blumerg WE, Eisinger J, Lamola AA, Zuckerman DM. Zinc protoporphyrin level in blood determined by a portable hematofluorometer—a screening device for lead poisoning. J Lab Clin Med. 1977;89:712–3.