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								[1]
								
A. I. Akhiezer and V. B. Berestetskii,Quantum Eectrodynamics, Oak Ridge, 1957.[2] You Ke, Tane Xiaotvei; Yang Baozhong,Li Yaogong, Chinese Phys. Lett., 3(1986), 345
 
A. I. Akhiezer and V. B. Berestetskii,Quantum Eectrodynamics, Oak Ridge, 1957.[2] You Ke, Tane Xiaotvei; Yang Baozhong,Li Yaogong, Chinese Phys. Lett., 3(1986), 345