Division of Nature Protection, Institute of Biotechnology and Environmental Sciences, University of Zielona Góra, Monte Cassino 21B, PL-65-561 Zielona Góra, Poland
Paweł Czechowski
Institute for Tourism and Recreation, State Higher Vocational School in Sulechów, Armii Krajowej 51, PL-66-100 Sulechów, Poland
Leszek Jerzak
Division of Nature Protection, Institute of Biotechnology and Environmental Sciences, University of Zielona Góra, Monte Cassino 21B, PL-65-561 Zielona Góra, Poland