1. Baur, G., Pauli, M., Trautmann, D.: Nucl. Phys. A224, 477 (1974)
2. Edmonds, A.R.: Angular Momentum in Quantum Mechanics. Princeton: Princeton University Press 1957
3. Messiah, A.: Quantum Mechanics. Amsterdam: North-Holland 1970
4. Trautmann, D., Alder, K.: Helv. Phys. Acta43, 363 (1970)
5. Mott, N.F., Massey, H.S.W.: The Theory of Atomic Collisions. Oxford: Oxford University Press 1965