J. A. Valdueza, J. Sta Ana, A. Junsay, A. Dacuya, and B. Ebarvia, “Method Development and Validation of Gas Chromatography Methods using Nitrogen Phosphorus Detector (GC-NPD) and Isotope Dilution Triple Quadrupole Mass Spectrometry (GC-IDMS/MS) for the Determination of Chlorpyrifos in Mango”, KIMIKA, vol. 33, no. 1, pp. 1–8, Mar. 2022.