@article{AGMS_2013_1_1_a13,
     author = {Haj{\l}asz, Piotr and Mirra, Jacob},
     title = {The {Lusin} {Theorem} and {Horizontal} {Graphs} in the {Heisenberg} {Group}},
     journal = {Analysis and Geometry in Metric Spaces},
     pages = {295--301},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {2013},
     zbl = {1286.46036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AGMS_2013_1_1_a13/}
}