ESSEN R. von [red.] 296,081 PROCEEDINGS Proceedings of the Finnish-Soviet Symposium on Seronegative Arthritis Rheumatism Foundation Hospital, Heinola. September 25 -27, 1983 / ed. H. A. Isomäki and R. von Essen. - Stockholm : Almqvisst and Wiksell, 1984. 92 s. : il., wykr. 26 cm Scandinavian Journal of Rheumatology ; suppl. 52 ISSN 0301-3847