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Bibliography

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    R.L. Bryant and L. Hsu, Rigidity of integral curves of rank 2 distributions, Inventiones Mathematicae 114.2 (1993): 435-462.
    • [2]
      R. Montgomery, Engel defermations and contact structures, Translations of the American Mathematical Society 196 (1999): 103-117
      • [3]
        F. Presas and L.E. Solá Conde, Holomorphic Engel structures, Rev Mat Complut (2014) 27: 327.
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          T. Vogel, Existence of Engel structures, Ann.of Math. 169 (2009), 79--137.

            Cite this as: AimPL: Engel structures, available at http://aimpl.org/engelstr.