Polish Journal of Natural Sciences
Polish Journal of Natural Sciences > 2009 > 24 > 4 > 207-223
Polish Journal of Natural Sciences > 2009 > 24 > 4 > 198-206
Polish Journal of Natural Sciences > 2009 > 24 > 4 > 187-197
Polish Journal of Natural Sciences > 2009 > 24 > 4 > 224-234
Polish Journal of Natural Sciences > 2009 > 24 > 4 > 235-244