@article{RMI_2007_2007_1_a18,
     author = {Ferrari, F. and  Franchi, B. and  Pajot, H.},
     title = {The {Geometric} {Traveling} {Salesman} {Problem} in the {Heisenberg} {Group.}},
     journal = {Revista matem\'atica iberoamericana},
     pages = {437-480},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_2007_2007_1_a18/}
}