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3. Schaum's Outline of Theory and Problems of First Year College Mathematics;Ayers,1958
4. Soil pores;Clothier,2008
5. On the laws of water movement in soil (in Danish, with a French summary). Det kgl. Danske Videnskabernes Selskabs Skrifter, 5te Raekke, naturvidenskabelig og mathematisk afdeling: Copenhagen;Colding,1872