@article{10_1090_S0894_0347_1988_0924699_9,
     author = {Jerison, David and Lee, John M.},
     title = {Extremals for the {Sobolev} inequality on the {Heisenberg} group and the {CR} {Yamabe} problem},
     journal = {Journal of the American Mathematical Society},
     pages = {1--13},
     publisher = {mathdoc},
     volume = {01},
     number = {1},
     year = {1988},
     doi = {10.1090/S0894-0347-1988-0924699-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1988-0924699-9/}
}