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Acknowledgements

Authors are grateful to V.I. Krinsky, E.E. Shnol and C.F. Starmer and anonymous referees for useful comments and encouraging discussions. This work was supported in part by grants from Russian Fund for Basic Research (93-011-16080 and 96-01-00592), The Wellcome Trust (045192) and EPSRC ANM (GR/K49775).



Vadim Biktashev
Sun Apr 13 11:38:06 GMT 1997