This book contains - L.J. Sciacca and R.J. Evans, Multidimensional Inverse Problems in Ultrasonic Imaging. M. Ohki, M.E. Zervakis, and A.N. Venetsanopoulos, 3-D Digital Filters. F.L. Lewis, Techniques in 2-D Implicit Systems. A. Moghaddamjoo and M. Allam, Techniques in Array Processing by Means of Transformation. W.-S. Lu and A. Antoniou, Application of the Singular-Value Decomposition in the Design of Two-Dimensional Digital Filters. V. Ramachandran and C.S. Gargour, Generation of Very Strict Hurwitz Polynomials and Applications to 2-D Filter Design. C.S. Gargour and V. Ramachandran, Generation of Stable 2-D Transfer Functions Having Variable Magnitude Characteristics. J.K. Bates, A Model of AuditoryPerception. Subject Index.