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Zentani A, Burslem J (December 2009). "Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. BET 4: use of litmus paper in chemical eye injury". Emerg Med J. 26 (12): 887. doi:10.1136/emj.2009.086124. PMID19934140. S2CID38124735.