kw.\*:("HELGOLAND,1976")
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ECOSYSTEM RESEARCH. INTERNATIONAL HELGOLAND SYMPOSIUM; HELGOLAND; 1976.1977; HELGOLAEND. WISSENSCH. MEERESUNTERS.; DTSCH.; DA. 1977; VOL. 30; NO 1-4; PP. 1-735; BIBL. DISSEM.Conference Paper