R. Sood, J.-M. Alakoskela, A. Sood, P. Vitovic, and P. K. Kinnunen, “Effect of Spacer Length on the Specificity of Counterion-Cationic Gemini Surfactant Interaction”, J. Appl. Sol. Chem. Model., vol. 1, no. 1, pp. 13–24, Oct. 2012.