TY - JOUR AU - Alfred K. Louis TI - Nonuniqueness in Inverse Radon Problems: The Frequency Distribution of the Ghosts. JO - Mathematische Zeitschrift PY - 1984 SP - 429 EP - 440 VL - 185 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZ_1984__185_173412/ ID - MZ_1984__185_173412 ER -