@article{10_1007_s10587_013_0043_z,
     author = {Grivaux, Sophie and Roginskaya, Maria},
     title = {Some new examples of recurrence and non-recurrence sets for products of rotations on the unit circle},
     journal = {Czechoslovak Mathematical Journal},
     pages = {603--627},
     publisher = {mathdoc},
     volume = {63},
     number = {3},
     year = {2013},
     doi = {10.1007/s10587-013-0043-z},
     mrnumber = {3125645},
     zbl = {06282101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-013-0043-z/}
}