Laitip, N., N. Chomnawang, N. Youngvises, and W. Threeprom. 2013. “Utilization of Microfluidic Device for Determination of Nitrite and Nitrate in Water and Soil Samples”. Asian Journal of Chemistry 25 (12):6486-90. https://doi.org/10.14233/ajchem.2013.13745.