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- [22] 13th International Symposium on Plasma Chemistry HIGH TEMPERATURE MATERIAL PROCESSES, 1997, 1 (03): : VII - VIII
- [23] 13th Annual mineral processing symposium Journal of The South African Institute of Mining and Metallurgy, 1994, 94 (11-12):
- [24] 13TH SCINTILLATION AND SEMICONDUCTOR COUNTER SYMPOSIUM APPLIED OPTICS, 1972, 11 (06): : 1453 - &