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Tripathi, Nimisha; Singh, Raj S.; Hills, Colin D. (2019). "Microbial removal of sulphur from petroleum coke (petcoke)". Fuel. 235: 1501–1505. doi:10.1016/j.fuel.2018.08.072. S2CID104564584.
Agarwal, P.; Sharma, D.K. (2011). "Studies on the Desulfurization of Petroleum Coke by Organorefining and Other Chemical and Biochemical Techniques Under Milder Ambient Pressure Conditions". Petroleum Science and Technology. 29 (14): 1482–1493. doi:10.1080/10916460902839230. S2CID94137920.