Abdelaleem, Eglal Abdelhamid, et al. “Development and Validation of Three Spectrophotometric Methods for Determination of Pyridostigmine Bromide in the Presence of Its Alkaline-Induced Degradation Product”. European Journal of Chemistry, vol. 6, no. 3, Sept. 2015, pp. 350-6, doi:10.5155/eurjchem.6.3.350-356.1283.