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- [1] 20TH INTERNATIONAL FREI,ROLAND,W. MEMORIAL SYMPOSIUM ON ENVIRONMENTAL ANALYTICAL-CHEMISTRY AND 4TH WORKSHOP ON THE CHEMISTRY AND ANALYSIS OF ENVIRONMENTAL HYDROCARBONS STRASBOURG, APRIL 17-21, 1990 PROCEEDINGS, .1. PREFACE FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 1991, 339 (07): : 449 - 450