author = { Graf, Renata AND Sobkowiak, Leszek },

title = { Usefulness of hydrographic and sozological databases in ecological studies of rivers in Poland },

publisher = {Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University},

isbn = {1644-7298},

keywords = { Ecological Modeling , Ecology , Geography, Planning and Development , Ecology, Evolution, Behavior and Systematics },

year = {2012},

url = { http://slubdd.de/katalog?TN_libero_mab2 }