@article{MS2_1975__37_166448,
     author = {A. van Daele},
     title = {On the spectrum of the analytic generator.},
     journal = {Mathematica Scandinavica},
     pages = {307--318},
     publisher = {mathdoc},
     volume = {37},
     year = {1975},
     zbl = {0325.46067},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__37_166448/}
}