1. De Labiis leporinis, von Hasenscharten;Hoffman,1686
2. Congenital oral deformities;McNeil;Br Dent J,1956
3. An extraorally activated expansion appliance for cleft palate infants;Latham;Cleft Palate J,1976
4. Preoperative lip taping in the cleft lip;Pool;Ann Plast Surg,1994
5. Lip adhesion and its effect on the maxillofacial complex in complete unilateral clefts of the lip and palate;Meijer;Cleft Palate J,1978