@article{10_4153_CJM_1992_011_3,
     author = {Sunada, Toshikazu},
     title = {Group {C*-Algebras} and the {Spectrum} of a {Periodic} {Schr\"odinger} {Operator} on a {Manifold}},
     journal = {Canadian journal of mathematics},
     pages = {180--193},
     year = {1991},
     volume = {44},
     number = {1},
     doi = {10.4153/CJM-1992-011-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-011-3/}
}