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Nicola Arcozzi 1 ; Fausto Ferrari 1
@article{AFM_2008_33_1_a1, author = {Nicola Arcozzi and Fausto Ferrari}, title = {The {Hessian} of the distance from a surface in the {Heisenberg} group}, journal = {Annales Fennici Mathematici}, pages = {35--63}, publisher = {mathdoc}, volume = {33}, number = {1}, year = {2008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AFM_2008_33_1_a1/} }
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/