作者单位: | Faculty of Physics, A. Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland;Faculty of Physics, A. Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland;Faculty of Geography and Earth Sciences, A. Mickiewicz University, ul. Dziegielowa 27, 61-680 Poznan, Poland;Faculty of Geography and Earth Sciences, A. Mickiewicz University, ul. Dziegielowa 27, 61-680 Poznan, Poland;Faculty of Economics and Business Administration, VU University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands;Faculty of Geography and Earth Sciences, A. Mickiewicz University, ul. Dziegielowa 27, 61-680 Poznan, Poland
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