@article{MS2_1990__67_2_167122,
     author = {Man-Duen Choi and George A. Elliot},
     title = {Density of the self-adjoint elements with finite spectrum in an irrational rotation {C*-algebra.}},
     journal = {Mathematica Scandinavica},
     pages = {73--86},
     publisher = {mathdoc},
     volume = {67},
     number = {2},
     year = {1990},
     zbl = {0743.46070},
     url = {http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167122/}
}