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Polish Journal of Ecology > 2002 > Vol. 50, nr 1 > 69-78
Polish Journal of Ecology > 1998 > Vol. 46, no 1 > 65-73
Polish Journal of Ecology > 2002 > Vol. 50, nr 1 > 69-78
Polish Journal of Ecology > 1998 > Vol. 46, no 1 > 65-73