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Dedicated to Professor G. Tallini on the occasion of his 60th birthday
The author is a member of G.N.S.A.G.A. of C.N.R. This research has been partially supported by Italian M.P.I.
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Bader, L. Derivation of Fisher flocks. J Geom 37, 17–24 (1990). https://doi.org/10.1007/BF01230355
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DOI: https://doi.org/10.1007/BF01230355