Thanakorn Pluangklang และ Areerut Rimmai; Kanchana Sermsaeng; Sirinapa Noibungkha; Chaloensak Lao-ngam; Laddawan Chonsalasin. (2018) Improvement of extraction efficiency for spectrophotometric determination of NO3- and NO2- in Gunshot residues,An application for a shooting distance study. <i>Naresuan University Journal: Science and Technology</i>, <i>26</i>(3), 133-143.Thanakorn Pluangklang และ Areerut Rimmai; Kanchana Sermsaeng; Sirinapa Noibungkha; Chaloensak Lao-ngam; Laddawan Chonsalasin. "Improvement of extraction efficiency for spectrophotometric determination of NO3- and NO2- in Gunshot residues,An application for a shooting distance study". Naresuan University Journal: Science and Technology 26 (2018):133-143.Thanakorn Pluangklang และ Areerut Rimmai; Kanchana Sermsaeng; Sirinapa Noibungkha; Chaloensak Lao-ngam; Laddawan Chonsalasin. Improvement of extraction efficiency for spectrophotometric determination of NO3- and NO2- in Gunshot residues,An application for a shooting distance study. Naresuan University Graduate School:ม.ป.ท. 2018.