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