@article{MS2_1975__36_166416,
     author = {Kozo Yatuba},
     title = {A note on functions with a spectral gap.},
     journal = {Mathematica Scandinavica},
     pages = {280--286},
     publisher = {mathdoc},
     volume = {36},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__36_166416/}
}