STEEN L. [red.] 547,353 XXII Scandinavian Conference on Gastroenterology and XIII Scandinavian Meeting on Gastrointestinal Endoscopy : Umea, Sweden, June 1-3, 1989 : [Abstracts] / ed. by S. Dahlgren, A. Danielson and L. Steen. - [Oslo] : Universitetsforlaget, 1989. - 104 s. : il., wykr. ; 25 cm (Scandinavian Journal of Gastroenterology ISSN 0085-5928 ; vol. 24, suppl. 159)