D. McNally, A. Shephard, and E. Field, “Randomised, Double-Blind, Placebo-Controlled Study of a Single Dose of an Amylmetacresol/2,4-dichlorobenzyl Alcohol Plus Lidocaine Lozenge or a Hexylresorcinol Lozenge for the Treatment of Acute Sore Throat Due to Upper Respiratory Tract Infection”, J Pharm Pharm Sci, vol. 15, no. 2, pp. 281–294, Apr. 2012.