Prasong Tosranon. (1997) X-ray timer meter. Mahidol University,:ม.ป.ท.Prasong Tosranon. 1997. X-ray timer meter. ม.ป.ท.:Mahidol University,;Prasong Tosranon. X-ray timer meter. ม.ป.ท.:Mahidol University, 1997. Print.