1. Allen BL, Hajeh BF (1989) Mineral occurrence in soil environments. In: Dixon JB, Weed SB (eds) Minerals in soil environments, 2nd edn. Soil Sci Soc Am, Madison, Wisconsin, pp 199–278
2. Arnalds O, Hallmark CT, Wilding LP (1995) Andisols from four different regions of Iceland. Soil Sci Soc Am J 59: 161–169
3. Barnhisel RI, Bertsch PM (1989) Chlorites and hydroxy-interlayered vermiculite and smectite. In: Dixon JB, Weed SB (eds) Minerals in soil environments, 2nd edn. Soil Sci Soc Am, Madison, Wisconsin, pp 729–788
4. Bigham JM, Ciolkosz EJ (1993) Soil color. Soil Sci Soc Am Spe Publ No 31
5. Booltink HWG, Bouma J (1991) Physical and morphological characterization of bypass flow in a well-structured clay soil. Soil Sci Soc Am J 55: 1249–1254