Nonuniqueness in Inverse Radon Problems: The Frequency Distribution of the Ghosts. Alfred K. Louis — 1984 Mathematische Zeitschrift
Incomplete Data Problems in X-Ray Computerized Tomography. I. Singular Value Decomposition of the Limited Angle Transform. Alfred K. Louis — 1986 Numerische Mathematik
Incomplete Data problems in X-Ray Computerized Tomography. II. Truncated Projections and Region-of-Interest Tomography. Alfred K. Louis; Andreas Rieder Numerische Mathematik