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Dedicated to Professor N. K. Stephanidis on his 65th Birthday
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Blair, D.E., Koufogiorgos, T. When is the tangent sphere bundle conformally flat?. J Geom 49, 55–66 (1994). https://doi.org/10.1007/BF01228050
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DOI: https://doi.org/10.1007/BF01228050