Bernard, A., Roels, H., Buchet, J.-P., & Lauwerys, R. (1980). Comparison, By Sodium Dodecyl Sulfate-polyacrylamide Gel-electrophoresis, of Urinary Proteins Excreted By Workers Exposed To Cadmium, Mercury Or Lead. Toxicology Letters, 5(3-4), 219-222. https://doi.org/10.1016/0378-4274(80)90063-6 (Original work published 1980)