Tankamon Kampangkaew. (1999) Electronystagmography : a normative study in normal persons aged 40-60 years. Mahidol University,:ม.ป.ท.Tankamon Kampangkaew. 1999. Electronystagmography : a normative study in normal persons aged 40-60 years. ม.ป.ท.:Mahidol University,;Tankamon Kampangkaew. Electronystagmography : a normative study in normal persons aged 40-60 years. ม.ป.ท.:Mahidol University, 1999. Print.