@article{MZ_1984__185_173412,
     author = {Alfred K. Louis},
     title = {Nonuniqueness in {Inverse} {Radon} {Problems:} {The} {Frequency} {Distribution} of the {Ghosts.}},
     journal = {Mathematische Zeitschrift},
     pages = {429--440},
     publisher = {mathdoc},
     volume = {185},
     year = {1984},
     zbl = {0519.65080},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__185_173412/}
}