Pluangklang, T.; Rimmai, A.; Sermsaeng, K.; Noibungkha, S.; Lao-ngam, C.; Chonsalasin, L. Improvement of extraction efficiency for spectrophotometric determination of NO3- and NO2- in Gunshot residues; An application for a shooting distance study. Asian Health Sci.Tech.Rep. 2018, 26, 133-143.