Papers presented at a two-day international symposium organized by the Forum f'ur Allgemeine 'Okologie der Universit'at Bern and held in Interlaken in Apr. of 1995.
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Papers presented at a two-day international symposium organized by the Forum f'ur Allgemeine 'Okologie der Universit'at Bern and held in Interlaken in Apr. of 1995.
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