Acta Mathematica Vietnamica

2013, Volume 38, Issue 1, pp 145-164


Fifteen years of contact circles and contact spheres
Hansjörg Geiges, Jesús Gonzalo Pérez


Contact circles and contact spheres are geometric structures on 3-manifolds introduced by the authors some fifteen years ago. In this survey we review the main results about these structures and we include two as yet unpublished proofs.

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