@article{10_1090_S0894_0347_07_00577_2,
     author = {Friedl, Stefan and Vidussi, Stefano},
     title = {Symplectic {\ensuremath{\mathbf{S}}{\textonesuperior}{\texttimes}\ensuremath{\mathbf{N}}{\textthreesuperior},} subgroup separability, and vanishing {Thurston} norm},
     journal = {Journal of the American Mathematical Society},
     pages = {597--610},
     year = {2008},
     volume = {21},
     number = {2},
     doi = {10.1090/S0894-0347-07-00577-2},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-07-00577-2/}
}