Vacík, J., Rybka, V., Švorčík, V., Hnatowicz, V., Kobayshi, Y. Doping of ion irradiated PEEK from water solution of LiC1. Polymer Degradation and Stability. 1998, 62(-), 535-540. ISSN 0141-3910. E-ISSN 1873-2321.