1. H. Goldstein Classical Mechanics (2nd Edit. Addison-Wesley) (1980)
2. R.P. Feynman, R.B. Leighton, and M. Sands,The Feynman Lectures in Physics, Vol. 3, Quantum Mechanics, (Addison-Wesley) (1965).
3. R.P. Feynman, and A.R. Hibbs, Quantum Mechanics and Path Integrals, (McGraw-Hill) (1965).
4. A.G. Klein and S.A. Werner, Rep.Prog.Phys. 46 pp259–335 (1983)
5. S.A. Werner and A.G. Klein in Methods of Experimental Physics edited by K.Skold and D.L.Price (Academic New York 1986) Vol.23 pp259–337.