1. Bauhinus J. Observationum Medicarum. Liber 11. Observ 264, Francfurti; 1595. p. 507.
2. Ravitch MM. The operative treatment of pectus excavatum. Ann Surg. 1949;129(4):429–44.
3. Ravitch MM. The chest wall. In: Welch KJ, Randolph JG, Ravitch MM, O'Neill JA, Rowe MI, editors. Pediatric surgery. 4th ed. Chicago: Year Book Medical Publishers; 1986.
4. Wallgren GR, Sulamaa M. Surgical treatment of funnel chest. Exhib VIII. Intl Cong Paedriat. 1956;32.
5. Adkins PG, Blades B. A stainless steel strut for corrections of pectus excavatum. Surg Gynecol Obstet. 1961;113:111–3.