Nogueira, Carlos, 		Santos, Jorge, 		Marcos, Mário, AND 		Matos, Eduarda.
" Efficacy, safety and long-term follow-up of laparoscopic Heller’s myotomy with anterior fundoplication in Achalasia" <em>Revista Portuguesa de Cirurgia</em> [Online],  Number 9 (25 June 2009)