P. . Cherdchoo-ngarm, . T. . Kolladaruengkri, S. . Chomchai, D. . Pisalsarakij, A. . Amornrat, and T. . Deechoo, “Measurement of Ethylene Oxide Gas and Calculation of a Safe Period for Contact at the Medical Sterilization Unit in Siriraj Hospital”, Siriraj Med J, vol. 56, no. 3, pp. 129–134, Mar. 2004.