@article{10_2307_121110,
     author = {J.Marshall Ash and Gang Wang},
     title = {Some spherical uniqueness theorems for multiple trigonometric series},
     journal = {Annals of mathematics},
     year = {2000},
     volume = {151},
     number = {1},
     doi = {10.2307/121110},
     zbl = {0955.42010},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121110/}
}