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Polish Journal of Ecology > 2013 > 61 > 4
Polish Journal of Ecology > 2013 > Vol. 61, nr 4 > 739--748
Archiwum Ochrony Środowiska > 2002 > Vol. 28, no. 1 > 81-95
Water Science and Technology > 1995 > 31 > 11 > 127-133