@article{PIM_1982_N_S_32_46_a4,
     author = {Richard Bieberich},
     title = {On {The} {Frequency} {With} {Which} {Bounded} {Functions} {Have} {Spectral} {Gaps}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {27 },
     publisher = {mathdoc},
     volume = {_N_S_32},
     number = {46},
     year = {1982},
     url = {http://geodesic.mathdoc.fr/item/PIM_1982_N_S_32_46_a4/}
}