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202 J. M. ANDRÉ ET AL.
at low electric field and at a sufficiently large distance to allow for broken symmetry
solutions.

Acknowledgements

The authors would like to acknowledge the support of the convention 9.4593.92 from
the Belgian National Science Foundation Fonds National de la Recherche
Scientific and of its associated Foundation Fonds de la Recherche
Fondamentale et Collective). One of us (L.P.) acknowledges also the support by the BST-
439/23/93 project of the Department of Chemistry, University of Warsaw, Poland.
D.H.M. thanks the Belgian Ministry of Science (SPPS) for financial support.

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4. G. Berthier, Folia Chimica Acta, 15, 67 (1987)