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Dedicated to professor N.K. Stephanidis on his 65th birthday
Supported by funds of the M.R.S.T.
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Perrone, D. Tangent sphere bundles satisfying ∇ξτ=0. J Geom 49, 178–188 (1994). https://doi.org/10.1007/BF01228060
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DOI: https://doi.org/10.1007/BF01228060