1. Morelli, J.J., and G. Szajer, Analysis of Surfactants: Part I, J. Surfact. Deterg 3:539 (2000)
2. Wilkes, A.J., C. Jacobs, G. Walraven, and J.M. Talbot, Characterization of Quaternized Triethanolamine Esters (esterquats) by HPLC, HRCGC and NMR, 4th World Surfactants Congress, Asociacion Espanola de Productores de Sustancias para Aplicaciones Tensioactivas, Barcelona, 1996, Vol. 1, p. 389.
3. Hunkeler, D., H. Ni, J. Hernandez-Barajas, and M. Petro, HPLC Analysis of Mixtures of Acrylamide and Cationic Quaternary Ammonium Monomers, Int. J. Polym. Anal. Charact. 2:409 (1996).
4. Song, M., and S.-Q. Liang, Spectrophotometric Determination of Cationic Surfactants by Formation of Ternary Complexes with Fe(III) and Chrome Azurol S, Chin. J. Chem. 14:228 (1996).
5. Hellmann, H., Detection and Quantification of the New Fabric Rinse Agent Distearylimidazoline Ester, Vom Wassers 85:401 (1995)