by Spectroscopy(London:1962).
by Molecular spectroscopy (4: 1968: London).
by Gas Chromatography (7th : 1968 : Copenhagen).
by Institute of Petroleum(1964: Brightom).
by Harbourn, CLA.
by Gas Chromatography (5th : 1964 : Brighton).
by Gas Chromatography (6th:1966:Rome).
by Butlin, A. G. comp.
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