Stacking in micellar electrokinetic chromatography for on-column sample pre-concentration of hydrophilic organophosphorus pesticides / by Wan Aini Wan Ibrahim, author, S. M. Monjurul Alam, author, A. B. Sulaiman, author, Shigeru Terabe, author, International Symposium on Capillary Chromatography and Electrophoresis (ISCCE 2009) (33rd : 2009 : Oregon, USA)