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Dobrowolski R., Mroczek P., Bieganowski A., Ryżak M.:  Role of Periglacial Processes in Epikarst Morphogenesis: A Case Study from Chełm Chalk Quarry, Lublin Upland, Eastern Poland (2012 r.) Permafrost and Periglacial Processes 2012, Vol. 23, 251-266