Thepnuan, D., P. . . Phromsenjai, P. . . Krasitnitikul, and W. . Insian. “Optimized Conditions of Acid Digestion Procedure for Metals Determination in PM2.5 Samples by ICP-OES”. Burapha Science Journal, vol. 29, no. 3 September-December, Oct. 2024, pp. 1033-46, https://li05.tci-thaijo.org/index.php/buuscij/article/view/538.