@article{AGMS_2015_3_1_a12,
     author = {Haj{\l}asz, Piotr and Zimmerman, Scott},
     title = {Geodesics in the {Heisenberg} {Group}},
     journal = {Analysis and Geometry in Metric Spaces},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {2015},
     zbl = {1328.53039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AGMS_2015_3_1_a12/}
}