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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Comparison of the number of scientific publications on “Halloysite”, “Kaolinite”, “Montmorillonite” and “Sepiolite” refined each with the term “drug”. Data analysis of publications, as of June 2018, was done using the SciFinder Scholar search system.