PICOSECOND PHOTOINDUCED OPTICAL ANISOTROPY IN TRANS - (CH)x : DIRECT MEASUREMENT OF SOLITON DIFFUSION Z. Vardeny, J. Strait, D. Moses, T.-C. Chung et A.J. Heeger J. Phys. Colloques, 44 C3 (1983) C3-403-C3-405 DOI: 10.1051/jphyscol:1983381