Forest-cover increase does not trigger forest-fragmentation decrease : case study from the Polish Carpathians / Kozak Jacek , Ziółkowska Elżbieta , Vogt Peter, Dobosz Monika , Kaim Dominik , Kolecka Natalia , Ostafin Krzysztof // Sustainability. - 2018 vol. 10 no. 5. - eISSN 2071-1050