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Allen, J. M., Allen, S. K., & Baertschi, S. W. (2000). 2-Nitrobenzaldehyde: a convenient UV-A and UV-B chemical actinometer for drug photostability testing. Journal of Pharmaceutical and Biomedical Analysis, 24(2), 167–178. doi:10.1016/s0731-7085(00)00423-4 
10.1016/S0731-7085(00)00423-4