1. Double lip and double lip with blepharochalasis (Ascher’s syndrome);Barnett;Oral Surg,1972
2. Double lip;Morgan;Oral Surg Oral Med Oral Pathol,1960
3. Double lip;Swerdloff;Oral Surg Oral Med Oral Pathol,1960
4. Double lip: Report of five cases and review of literature;Suliman;Aesthetic Surg J,2007
5. Congenital double lip: Review of five cases;Eski;Br J Oral Maxillofac Surg,2007