1. The maxillary interincisal diastema and its relationship to the superior labial frenum and intermaxillary suture;Popovich;Angle Orthod,1977
2. Relapse after orthodontic correction of maxillary median diastema: a follow-up evaluation of consecutive cases;Shashua;Angle Orthod,1999
3. Biracial study of the maxillary midline diastema;Richardson;Angle Orthod,1973
4. Spaced dentition, an epidemiological study;Steigman;Angle Orthod,1985
5. Incidence of the maxillary midline diastema in adults;McVay;J Prosthet Dent,1984