Wongtiraporn, W., Opartkiattikul, N. and Tientadakul, P. (2003) “The Value of Local ISI Calibration in Correcting the Variability in INR Determination”, Siriraj Medical Journal, 55(7), pp. 381–384. available at: https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245416 (accessed: 27 August 2026).