Mohammedbrahim, B., Buchet, J.-P., & Lauwerys, R. (1985). Erythrocyte Pyrimidine 5′-nucleotidase Activity in Workers Exposed To Lead, Mercury Or Cadmium. International Archives of Occupational and Environmental Health, 55(3), 247-252. https://doi.org/10.1007/BF00383757 (Original work published 1985)