302,448 NATIONAL 20th National Cancer Congress of the German Cancer Society Berlin, 16-20 March 1992 : abstracts of lectures and posters /special vol. eds. H. Maass, W. Jonat. - [Berlin] : [Springer-Intern.], 1992. -VI, 197 s. ; 30 cm (Journal of Cancer Research and Clinical Oncology, ISSN 0171-5216 ; vol. 118)