1. WHO, Inorganic Mercury, Report of a WHO Study Group, World Health Organization, Geneva, 1991, (WHO — Environmental Health Criteria 118), p. 169.
2. WHO, Recommended Health-Based Limits in Occupational Exposure to Heavy Metals, Report of a WHO Study Group, World Health Organization, Geneva, 1980, (WHO — Technical Report Series, No. 647), p. 116.
3. WHO, Mercury, Report of a WHO Study Group, World Health Organization, Geneva, 1976, (WHO — Environmental Health Criteria 1), p. 133.
4. M.H. Ho, Piezoelectric Crystal Sorption Detectors and Their Applications in Chemical and Environmental Analysis, Ph. D. Dissertation, University of New Orleans, New Orleans, LA, 1981, p. 72.