Callen, Roger A. (1984): Clays of the palygorskite-sepiolite group; depositional environment, age and distribution. Elsevier Sci. Publ., Amsterdam, Netherlands, In: Singer, Arieh (editor), Galan, Emilio (editor), Palygorskite - sepiolite occurrences, genesis and uses, 37, 1-37, georefid:1985-021505

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