1. Colorimetric Method for Quantitative Microdetermination of Quaternary Ammonium Compounds
Jørgen. Fogh, P. O. H. Rasmussen, Knud. Skadhauge
Anal. Chem., 1954, 26 (2), pp 392–395
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http://dx.doi.org/10.1021/ac60086a031Michel van Bruijnsvoort, Joop Rooselaar, Alfred G. Stern, Klaas M. Jonker
Journal of AOAC INTERNATIONAL, 2004, Vol.87, Iss.4 P.1016-1020
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http://www.atypon-link.com/AOAC/doi/abs/10.5555/jaoi.2004.87.4.1016