Finite distance between distinct Calabi-Yau manifolds.

@article{Candelas1989FiniteDB,
  title={Finite distance between distinct Calabi-Yau manifolds.},
  author={Candelas and Green and H{\"u}bsch},
  journal={Physical review letters},
  year={1989},
  volume={62 17},
  pages={
          1956-1959
        }
}
Moduli spaces for a wide class of Calabi-Yau manifolds with different numerical invariants (and thus topologically distinct) can be assembled into a connected ''web'' in which all distances are finite. This increases the plausibility of phase transitions among the corresponding superstring vacua. 
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