Abstract
In dimension 5 there exist precisely four pairwise nondiffeomorphic biquotients of which only one is not a homogeneous space.
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Pavlov, A.V. Five-Dimensional Biquotients. Siberian Mathematical Journal 45, 1080–1083 (2004). https://doi.org/10.1023/B:SIMJ.0000048923.81718.a5
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DOI: https://doi.org/10.1023/B:SIMJ.0000048923.81718.a5