1. Congenital midline defects of the midface;Baibak;Cleft Palate J.,1966
2. Pits of the lip commissures in Caucasoid males;Baker;Oral. Surg.,1966
3. Commissural lip pits;Everett;Oral Surg.,1961
4. Über die kongenitale Oberlippenfistel;Fenner;Dtsch. zahnärztl. Z.,1969
5. Angeborene Oberlippenfistel;Feurer;Arch. klin. Chir.,1893