Ratikorn Kittada. (1997) Estimation of exposure in diagnostic x-ray machine. Mahidol University,:ม.ป.ท.Ratikorn Kittada. 1997. Estimation of exposure in diagnostic x-ray machine. ม.ป.ท.:Mahidol University,;Ratikorn Kittada. Estimation of exposure in diagnostic x-ray machine. ม.ป.ท.:Mahidol University, 1997. Print.