@article{JRAM_1997__492_153957,
     author = {Florin P. Boca},
     title = {The structure of higher-dimensional noncommutative tori and metric diophantine approximation.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {179--219},
     publisher = {mathdoc},
     volume = {492},
     year = {1997},
     zbl = {0884.46040},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__492_153957/}
}