Simeon Angelov

University Paris VI, Laboratory "Mineralogy and Crystallography", Paris 75230 Cedex 05
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Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia 1113
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Geological Institute "Strashimir Dimitrov", Bulgarian Academy of Sciences, Sofia 1113
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Geological Institute "Strashimir Dimitrov", Bulgarian Academy of Sciences, Sofia 1113

Volume 18 5 October 1988