Não informado. (1977). South African journal of chemistry. Foundation for Education, Science and Technology.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. South African Journal of Chemistry. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. South African Journal of Chemistry. Foundation for Education, Science and Technology, 1977.
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