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Weinstein, Alan (1974-01-01). "On the volume of manifolds all of whose geodesics are closed".
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Kazdan, Jerry L. (1982). "An isoperimetric inequality and
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term meaning "seeing again". As it turns out, in each dimension
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Berger, Marcel (1978). "Blaschke's
Conjecture for Sphere".
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For example, on an ordinary sphere where the geodesics are
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on a (usually, but not necessarily, two-dimensional)
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323:(1980).
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