1. Fundamental Factors Governing the Streamline Flow of Water Through Sand
2. Flow of a Gas Through Porous Media
3. Loeb, L.B. "The Kinetic Theory of Gases," 2nd ed. New York and London, McGraw-Hill Book Co., Inc., 1934, p. 283.
4. Loeb, L.B. "The Kinetic Theory of Gases," 2nd ed. New York and London, McGraw-Hill Book Co., Inc., 1934, p. 293.