Positron annihilation study in polyaniline conducting polymer Z.L. PENG, S.Q. LI, Y.Q. DAI, B. WANG, S.J. WANG, H. LIU and H.Q. XIE J. Phys. IV France, 03 C4 (1993) C4-253-C4-255 DOI: 10.1051/jp4:1993438