Invariant Theory of Matrices; H. Aslaksen, et al. Symmetries of Elementary Particles Revisited; A.O. Barut. Perturbative SU(1,1); H. Beker. A Dual Structure for the Quantal Rotation Group, SU(2); L.C. Biedenharn, M.A. Lohe. Some Points in the Quantization of Relativistic Grassmann Dependent Interaction Systems; A. Del Sol Mesa, R.P. Martinez y Romero. q-Difference Intertwining Operators for Uq(sI(4)) and q-Conformal Invariant Equations; V.K. Dobrev. A Quantum Mechanical Evolution Equation for Mixed States from Symmetry and Kinematics; H.D. Doebner, J.D. Hennig. Quantum Mechanical Motions over the Group Manifolds and Related Potentials; I.H. Duru. Quantum Violation of Weak Equivalence Principal in the Brans-Dicke Theory; Y. Fujii. Quantum Unitary and Pseudounitary Groups and Generalized Hadron Mass Relations; A.M. Gavrilik. Linear Coxeter Groups; J. Getino. Diffeomorphism Groups, Quasiinvariant Measures, and Infinite Quantum Systems; G.A. Goldin, U. Moschella. Algebraic Shells and the Interacting Boson Model of the Nucleus; B. Gruber. Recent Developments in the Application of Vector Coherent States; K.T. Hecht. Algebraic Theory of the Threebody Problem; F. Iachello. 18 additional articles. Index.