published by Damascus University in 2003 in Chemistry and research's language is العربية
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Abstract in English
References used
CONCAWE,s Petroleum Products and Health Management Group, Petroleum coke, Bruussels, October 1993
Osypov, O.A., Minkin, V. E., Havad Book of diplole momenuts, vishaya Shcola, 1965 Moscou.PP.64
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