@ARTICLE{Nowak_Bogumił_M._Natural_2019,
 author={Nowak, Bogumił M. and Ptak, Mariusz},
 number={No 40},
 journal={Journal of Water and Land Development},
 howpublished={online},
 year={2019},
 publisher={Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute},
 title={Natural and anthropogenic conditions of water level fluctuations in lakes – Lake Powidzkie case study (Central-Western Poland)},
 URL={http://journals.pan.pl/Content/111665/PDF-MASTER/Nowak%20i%20Ptak.pdf},
 keywords={climatic conditions, environmental anthropopressure,, Lake Powidzkie,, water level changes, water resources},
}