Tue-Ngeun, O. (2014). Development of flow injection analysis systems for the determination of phosphate nitrite nitrate chromium and calcium / Orawan Tue-Ngeun. Chiang Mai : Graduate School, Chiang Mai University, 1997.

Tue-Ngeun, Orawan. Development of Flow Injection Analysis Systems for the Determination of Phosphate Nitrite Nitrate Chromium and Calcium / Orawan Tue-Ngeun. Chiang Mai : Graduate School, Chiang Mai University, 1997, 2014.

Tue-Ngeun, Orawan. Development of Flow Injection Analysis Systems for the Determination of Phosphate Nitrite Nitrate Chromium and Calcium / Orawan Tue-Ngeun. Chiang Mai : Graduate School, Chiang Mai University, 1997, 2014.