References
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- March , N. H. and Santamaria , R. 1988 . Phys. Rev. , A38 : 5002
- Heilmann , O. J. and Lieb , E. H. 1995 . Phys. Rev. , A52 : 3628
- March , N. H. 1996 . Phys. Rev. , A54 : 5415
- Miller , W. 1972 . Symmetry groups and their applications , London : Academic Press . See, for example
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- Hostler , L. 1964 . J. Math. Phys. , 5 : 591
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- Amovilli , C. and March , N. H. submitted for publication