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Polish Journal of Ecology > 2003 > 51 > 2
Polish Journal of Ecology > 2003 > 51 > 2
Polish Journal of Ecology > 2003 > 51 > 2
Polish Journal of Ecology > 2003 > 51 > 2
Polish Journal of Ecology > 2003 > 51 > 2
Polish Journal of Ecology > 2003 > 51 > 2
Acta Hydrobiologica > 1997 > 39 > 3-4