1. Azar, A., Trochimowicz, H.J., Maxfield, M.E.: Review of lead studies in animals carried out at Haskell Laboratory - Two-year feeding study and response to hemorrhage study. In: Environmental Health Aspects of Lead, Internat. Symposium 1972, ed. by CED Centre for Information and Documentation, Luxembourg 1973, pp. 199-210
2. Baloh, R.W.: Laboratory diagnosis of increased lead absorption. Arch. Environ. Health 28, 198–208 (1974)
3. Berlin, A., Schaller, K.H.: European standardized method for determination of δ-aminolevulinic acid dehydratase activity in blood. Z. Klin. Chem. Klin. Biochem. 12, 389–390 (1974)
4. Binnendijk, J., cited by Stokvis, B.J.: Zur Pathogenese der Hamatoporphyrinurie. Z. Klin. Med. 28, 1 (1895)
5. Bonsignore, D., Calissano, P., Cartasegna, C.: Un semplice metodo per la determinazione della δ-amino-levulinico-deidratasi nel sangue. Med. Lav. 56, 199–205 (1965)