PRACE DOKTORSKIE - SZWECJA 605,910 LOFBERG ROBERT Studies in longstanding ulcerative colitis : with special reference to malignant transformation of the colorectal mucosa: [thesis]/ by Robert Lofberg ; Karolinska Institute, Department of Medical Radiobiology. - Stockholm : Kongl. Carolinska Medico Chirurgiska Institutet, 1989. - 45 s. : il., ; 25 cm (Acta Chirurgica Scandinavica, ISSN 0301-1860 ; suppl. 552) ISBN 91-7900-816-X