Wipharat Chuachuad. (1999) Comparison of analytical techniques for trace metals for the certification of in-house rice flour reference material. Mahidol University,:ม.ป.ท.Wipharat Chuachuad. 1999. Comparison of analytical techniques for trace metals for the certification of in-house rice flour reference material. ม.ป.ท.:Mahidol University,;Wipharat Chuachuad. Comparison of analytical techniques for trace metals for the certification of in-house rice flour reference material. ม.ป.ท.:Mahidol University, 1999. Print.