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2. ASTM International (2013) ASTM D5333-92 standard test methods for measurement of collapse potential of soils
3. ASTM International (2013) ASTM D4647/D4647M-13 standard test methods for identification and classification of dispersive clay soils by the pinhole test
4. ASTM International (2013) ASTM D6572-13e2 standard test methods for determining dispersive characteristics of clayey soils by the crumb test
5. ASTM International (2018) ASTM D4221-18 standard test method for dispersive characteristics of clay soil by double hydrometer