Problems in gastrointestinal endoscopy / Authors Philip E. Donahue ; Lloyd M. Nyhus, Catherine Judge. -- Philadelphia : J.B. Lippincott Co., 1990. -- 214 s. -- (Problems in General Surgery. Vol. 7, Nr. 5. Special Issue). -- fareb. a čb. obr., tab., lit. -- ISBN 0-397-51163-9. -- ISSN 0739-8328. endoskopia gastrointertinálna