@article{articlee9573944,
title   = {Helicobacter pylori and refractory duodenal ulcers: cross-over comparison of continued cimetidine with cimetidine plus antimicrobials},
author = {Boyd, H K and Zaterka, S and Eisig, J N and Chinzon, D and Iriya, Kiyoshi and Laudanna, Antônio Atílio and Boyd, E J S},
year = {1994},
journal   = {American Journal of Gastroenterology}
}