Sengphouvanh Ngonephady. (1999) Prevalence of oral diseases in Savannakhet province, Lao People's Democratic Republic. Mahidol University,:ม.ป.ท.Sengphouvanh Ngonephady. 1999. Prevalence of oral diseases in Savannakhet province, Lao People's Democratic Republic. ม.ป.ท.:Mahidol University,;Sengphouvanh Ngonephady. Prevalence of oral diseases in Savannakhet province, Lao People's Democratic Republic. ม.ป.ท.:Mahidol University, 1999. Print.