@article{GT_2019_23_6_a6,
     author = {Faifman, Dmitry},
     title = {Contact integral geometry and the {Heisenberg} algebra},
     journal = {Geometry & topology},
     pages = {3041--3110},
     publisher = {mathdoc},
     volume = {23},
     number = {6},
     year = {2019},
     doi = {10.2140/gt.2019.23.3041},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2019.23.3041/}
}