R. Shojaeipour, S. Arya, شجاعی پورر., and آریاش., “Prevalence of Lingual eruption of mandibular permanent incisors and relationship between lingual eruption and arch– form in 6-8 years old Children in kerman”, Journal of Isfahan Dental School, vol. 5, no. 1, pp. 44-48, Aug. 2009.