Best constants for Moser-Trudinger inequalities on the Heisenberg group William CohnGuozhen Lu 35J1546E3558E35Heisenberg groupSobolev inequalitiesMoser-Trudinger inequalitiesbest constants Indiana University Mathematics Journal 2001 text pdf 10.1512/iumj.2001.50.2138 10.1512/iumj.2001.50.2138 en Indiana Univ. Math. J. 50 (2001) 1567 - 1592 state-of-the-art mathematics http://iumj.org/access/