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—Acta miner, petrogr. 24: 115-119, Suppl. Proceedings of the 10th Kaolin Symposium in Budapest, 3 September, 1979, IGCP project No 23. VARJÚ, G. (I960): Kaolin deposits of Hungary.—In: Proceedings of Symposium I. Kaolin Deposits of the World. A

—Europe. Report of the Twentythird Session, Czechoslovakia, 1968, Ed: J. Vachtl, Prague: 179-200. WERNER, H. J. & SMYKATZ-KLOSS, W. (1977): Correlation of measuring disorders in kaolinite group minerals by differential thermal analysis, infrared spectroscopy and X-ray diffractometry.

— Proceedings of 5th International Conference on Thermal Analysis, Kyoto: 526-527. WILSON, A. J. C. (1963): Mathematical Theory of X-ray Powder Diffractometry.—Philips Technical Library, p. 1-196. Authors' addresses : DR. GÉZA SZENDREI MARIA N. TÓTH Mineralogical and Petrological Department Hungarian Natural History Museum Budapest, pf. 330 H-1370 Laboratory for Geochemical Research Hungarian Academy of Sciences Budapest, pf. 132 H-1502