1. Azar, A., Snee, R.D., Habibi, K.: An epidemiologic approach to community air lead exposure using personal air samplers. In: Lead; T.B. Griffin and J.H. Knelson, eds., p. 254?290. Environmental quality and safety, suppl. Vol. II. Stuttgart: Thieme 1975
2. Berlin, A., Schaller, K.H., Smeets, J.: Standardization of ALA-D-activity determinations at the European level; intercalibration and applications. In: Proc. int. symp. Recent advances in the assessment of the health effects of environmetal pollution, CEC-WHO-EPA, Paris 1974, p. 1087?1100. Luxemburg, CEC, 1975
3. Goldbourt, E., Medalie, J.H.: Characteristics of smokers, non-smokers and ex-smokers among 10.000 adult males in Israel. II Physiologic, biochemical and genetic characteristics. Amer. J. Epidemiol. 105, 75?86 (1977)
4. Goldstein, B.D., Marks, C.E., Goldring, R.M.: Red cell 2, 3-diphosphoglyceric acid and methemoglobin levels in workmen occupationally exposed to automobile exhaust. Int. Arch. occup. environm. Hlth. 38, 295?300 (1977)
5. Jenkins, C.D., Zyzanski, S.J., Rosenmans, R.H.: Biological, psychological and social characteristics of men with different smoking habits. Quoted by Goldbourt et al. (1977). Health Serv. Rep. 88, 834?843 (1973)