@article{10_4153_CMB_1991_054_7,
     author = {Fieldsteel, Adam},
     title = {Poorly {Approximated} {Z2-Cocycles} {For} {Transformations} {With} {Rational} {Discrete} {Spectrum}},
     journal = {Canadian mathematical bulletin},
     pages = {338--342},
     year = {1991},
     volume = {34},
     number = {3},
     doi = {10.4153/CMB-1991-054-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-054-7/}
}