Determination of Urinary Methyl Hippuric Acid Using Shimadzu UV-Visible Spectrophotometer Among Petroleum Employees, Doddawad, Vidya Gowdappa, Gurupadayya B.M., S Shivananda, CS Vidya, Mohammed Azhar, and L Bhuyan , Pharmacognosy Journal, September 2021, Volume 13, Issue 5, p.1277-1281, (2021)