E. V. Mikubayeva, N. S. Kobotayeva, and E. E. Sirotkina, “Combined Sensitisation of Benzaldehyde Diphenylhydrazones: Effect of Hydrazone Structure on Sensitization Efficiency”, Eurasian Chem.-Technol. J., vol. 6, no. 2, pp. 133–138, Jun. 2004.