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Manifold schemes and foliations on the 2-torus and the Klein bottle. I. (English) Zbl 0393.57008

57R30 Foliations in differential topology; geometric theory
20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
58A99 General theory of differentiable manifolds
57S25 Groups acting on specific manifolds
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