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          Sub Title
              Influence of ion irradiation on free volume controlled diffusion process in polycarbonate-a positron lifetime study, G. Shariff, P.M. Sathyanarayana, M.C. Thimmegowda, M.B. Ashalata, R. Ramani, D.K. Avasthi and C. Ranganathaiah. Polymer 43 (2002) 2819.
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