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1
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2by International Union of Pure and Applied Chemistry. Committee on Teaching of Chemistry, University of the Witwatersrand (South Africa). Radmaste Centre, Somerset Educational (South Africa), Bell, Beverly, Lycoudi, M., Ovens, J., Bradley, J.D.programme and meeting document bibliotecaUNESCO
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3by International Union of Pure and Applied Chemistry. Committee on Teaching of Chemistry, University of the Witwatersrand (South Africa). Radmaste Centre, Somerset Educational (South Africa), Bell, Beverly, Lycoudi, M., Ovens, J., Bradley, J.D.programme and meeting document bibliotecaUNESCO