@article{MAN_1985__271_163961,
     author = {Hubert Flenner},
     title = {Babylonian {Tower} {Theorems} on the {Punctured} {Spectrum.}},
     journal = {Mathematische Annalen},
     pages = {153--160},
     publisher = {mathdoc},
     volume = {271},
     year = {1985},
     zbl = {0541.14011},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__271_163961/}
}