Mendyk, Łukasz, M. Markiewicz, M. Świtoniak, and R. Bednarek. “The Use of Orthophoto Map for Soils Mapping of Dwindling Lakes Catchment Areas: A Case Study of Sumowskie Lake, NE Poland”. Ecological Questions, vol. 17, July 2013, pp. 57 -, doi:10.12775/ecoq-2013-0016.