@inbook{inbooke21e5017,
title   = {Sate results of the heller operation: what is the role of radioactive transit in assessing the effectiveness of treatment?},
author = {Zilberstein, Bruno and Cecconello, Ivan and Domene, C E and Sallum, R. A. A. and Nasi, A. and Pinotti, H W},
year = {1991},
publisher = {John Libbey Eurotext},
journal   = {Primary Motility Disorders of the Esophagus}
}