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2. Pothole erosion in recent waterfalls;Ängeby;Lund Stud. Geogr. A,1951
3. Ströme der Erde;Czaya,1981
4. Types of river regimes in Poland (in Polish, with English summary);Dynowska,1971
5. Všeobecná geologie, III. Česk. Akad. Véd. Praha;Kettner,1954