Gargas M, Norton R, Harris MA, Paustenbach D, Finley B. 1994. Urinary excretion of chromium following ingestion of chromite ore processing residue in humans: Implications for biomonitoring. Risk Anal 14(6):1019-1024; doi: 10.1111/j.1539-6924.1994.tb00071.x. PMID: 7846309.