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Seifert, M.; Wermelinger, B. 1996, Spruce cone insects in Switzerland: abundance and effect on seed production. (Abstract 16-097) Proceedings, XX International Congress of Entomology, Firenze, Italy, August 25-31, 1996
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Wermelinger, B.; Hirschheydt, J.V.; Fecker, B. 1995, Abundance and emergence of spruce cone insects in different parts of Switzerland. Journal of Applied Entomology 119(1):9-15