1. ttude comparative de divers tests biologiques d'exposition au plomb;Basecqz, J.M.; Lauwerys, R.; Buchet, J.P.;Arch. Mal. prof,1971
2. Fernandez, A. A., and Jacobs, S. L. (1979)). Porphyrins, Porphobilinogen, and aminolaevulinic acid in urine. In Standard Methods of clinical Chemistry, edited by R. P. MacDonald, Vol. 6, pp. 57-71. Academic Press, New York.
3. Die einfachen Bestimmungsmethoden der 8-Aminol&vulinsAure im Ham;Grabecki, J.; Haduch, T.; Urbanowicz, H.;Int. Archiv fur Gewerbepathologie und Gewerbehygiene,1967
4. The occurrence and determination of 8-aminolevulinic acid and porphobilinogen in urine;Mauzerall, D.; Granick, S.;J. blol. Chem,1956
5. FENTON From the Department of Chemical Pathology, St Bartholomew's Hospital, London Recently a new specific electrode has been introduced for the measurement of ammonia. Until now this electrode appears to have been used only for industrial purposes (Midgley and Torrance, 1972) but this instrument can be used for the determination of ammonia in blood, and the method is sufficiently sensitive and simple for use in a routine clinical laboratory. A preliminary report on the use of a similar electrode system has been made in the United States;PARK', N.J.; B, J.C.,1972