1. F. R. Gantmakher:The Theory of Matrices (Chelsea, New York, N.Y., 1959).
2. P. W. Milonni andJ. H. Eberly:Lasers (John Wiley and Sons, New York, N.Y., 1988).
3. See,e.g.,A. Bertin,R. A. Ricci andA. Vitale (Editors):Fifty Years of Weak-Interaction Physics (Editrice Compositori, Bologna, 1984).
4. R. Courant andH. Snyder:Ann. Phys.,3, 1 (1958).
5. See,e.g.,K. Steffen:Basic Course on Accelerator Optics, CERN 85–19 (1985).