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								[1]
								Glauber, Roy, J. Phys. Rev.,131(1963),2766.[2] Bhaumik, D, et al., J. Phys, A9(1976),1507 .[3] Merzbacher, E., Quantum Mechanics, John Wiley and Sons Inc., 1970, p. 528. 
Glauber, Roy, J. Phys. Rev.,131(1963),2766.[2] Bhaumik, D, et al., J. Phys, A9(1976),1507 .[3] Merzbacher, E., Quantum Mechanics, John Wiley and Sons Inc., 1970, p. 528.