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2. Filters - General report (Session 9), General reports;Wolski,1987
3. Fundamentals of Soil Mechanics;Taylor,1948
4. Gravel and Sand Filters in Earth and Hydraulic Structures;Sichardt;Die Bautechnick,1952
5. A Contribution Towards to an Universal Specification of the Limiting Porosities of Granular Materials;Kolbuszewski,1963