1. Gonzalez-Ulloa, M.: Ptosis of the chin: The witches' chin. Plast. Reconstr. Surg. 50:54, 1972.
2. Loeb, R.: Elimination of the submandibular sulcus during correction of a double chin. Summary published in the Book of Abstracts, IV Congress of the International Society of Aesthetic Plastic Surgery, edited by Mario Gonzalez-Ulloa. Mexico, April 1977, p. 102.
3. Robertson, J. G.: Chin augmentation by means of rotation of double chin fat flap. Plast. Reconstr. Surg. 36:471, 1965.
4. Rogers, B. O.: The seagull or “mouette” incision for correction of double chins. In: Transactions of the Sixth International Congress of Plastic and Reconstructive Surgeons. Masson, Paris, 1976. p. 456.