Isolation of vanadium and nickel porphyrinic fractions from asphaltenes of a heavy crude petroleum by a combined chromatographic separation and vacuum sublimation method

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Osorio, E.
Angulo, E.
Segovia, S.
Ysambertt, F.
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Acta Cientifica Venezolana | 1994年 / 45卷 / 02期
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