Site of peptic Ulcer: comparison of hydrochloric acid output, pepsinogen and gastrin serum levels - Pinto Junior, Paulo; Gama Rodrigues, Joaquim José; Lopasso, Fabio Pinatel; Cordeiro, Anói Castro; Alquezar, Amadeo Saez; Laudanna, Antônio Atílio; Pinotti, Henrique Walter (Hepato-Gastroenterology, 1996)