Geodesic
Asymptotic behaviour at infinity of the admissible growth of the quasi-conformality coefficient and the invertibility of contact immersions of the Heisenberg group
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 65 (2010) no. 3, pp. 591-592 
V. A. Zorich. Asymptotic behaviour at infinity of the admissible growth of the quasi-conformality coefficient and the invertibility of contact immersions of the Heisenberg group. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 65 (2010) no. 3, pp. 591-592. http://geodesic.mathdoc.fr/item/RM_2010_65_3_a10/
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     title = {Asymptotic behaviour at infinity of the admissible growth of the quasi-conformality coefficient and the invertibility of contact immersions of the {Heisenberg} group},
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     pages = {591--592},
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     url = {http://geodesic.mathdoc.fr/item/RM_2010_65_3_a10/}
}
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