Sukesorn Panyawong และ Puangpen Tangboonduangjit. (2014) Comparative penumbral widths for small fields of 6 mv photon beam. Mahidol University:ม.ป.ท.Sukesorn Panyawong และ Puangpen Tangboonduangjit. 2014. Comparative penumbral widths for small fields of 6 mv photon beam. ม.ป.ท.:Mahidol University;Sukesorn Panyawong และ Puangpen Tangboonduangjit. Comparative penumbral widths for small fields of 6 mv photon beam. ม.ป.ท.:Mahidol University, 2014. Print.