P. B. da Silveira Júnior, V. A. de O. Tiera, and M. J. Tiera, “A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)”, Eclet. Quim., vol. 32, no. 2, pp. 47–54, Jun. 2007.