4Kirkegaard P, Eldrup M. Positron.fit extended: A new version of a program for analysing positionlifetime spectra[J]. Comput. Phys. Commun,1974, 7 : 401 - 409.
5P C Jain, S Bhatnagar,A Gupta. Positron annihilation in some high polymers[J]. J. Phys. C: Solid State Phys,1972, 5:2156-2162.
6B. Bergersen, M. J. Stott, Sol. Stat. Commun. ,1969, 7 : 1203.
7Dirac P A. Proc. Camb. Phil. Soc. Math. Phys. Sci,1930, 26:361.
8Foesch K eds. Phys. Stat. Sol,1974, A23:223.
9W Schilling, K Sonnenberg. Recovery of irradiated and quenched metals[J]. J. Phys. F : Metal Physics. 1973, 3(2) : 322 -350.
10Dimitrov C,Tentiand M,Dimitrov O. Resistivity recoveryin austenitic Fe - Cr - Ni alloys neutron irradiated at 23K[J]. J. Phys. F: Metal Physics. 1981,11 (4): 753 -765.
