@article{JEMS_2014_16_4_a1,
     author = {Yi Wang and Po-Lam Yung},
     title = {A subelliptic {Bourgain{\textendash}Brezis} inequality},
     journal = {Journal of the European Mathematical Society},
     pages = {649--693},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {2014},
     doi = {10.4171/jems/443},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/443/}
}