By McNaughton D.   Robertson E.G.   Hatherley L.D.   in Journal of Molecular Spectroscopy

ISSN:0022-2852|175|2|377-385

Academic Press‎(1996)‎

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By Robertson E. G.   Morrison R. J. S.   in Molecular Physics

ISSN:1362-3028|103|11-12|1625-1632

Taylor & Francis Ltd‎(2005)‎

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