1P. L. Mingazzini,L. Scucchi,D. Stefano,F. Malchiodi Albedi,F. Ciaralli,M. Falchi,V. Marinozzi. Expression of interphasic nucleolar organizer regions in normal, dysplastic and neoplastic colorectal mucosa[J] 1991,Virchows Archiv A Pathological Anatomy and Histopathology(6):487~491