Geodesic
The Hessian of the distance from a surface in the Heisenberg group
Nicola Arcozzi1 ; Fausto Ferrari1
1Dipartimento di Matematica dell’Università di Bologna
Annales Fennici Mathematici, Tome 33 (2008) no. 1, pp. 35-63 
Nicola Arcozzi; Fausto Ferrari. The Hessian of the distance from a surface in the Heisenberg group. Annales Fennici Mathematici, Tome 33 (2008) no. 1, pp. 35-63. http://geodesic.mathdoc.fr/item/AFM_2008_33_1_a1/
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     title = {The {Hessian} of the distance from a surface in the {Heisenberg} group},
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     number = {1},
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