@article{sakamoto_2003,  title={Dielectric spectroscopy and thermally stimulated discharge current in PEEK film},  volume={28},  ISSN={0100-4670},  url={https://doi.org/10.1590/S0100-46702003000200006},  DOI={10.1590/S0100-46702003000200006},  number={2},  journal={Eclética Química},  publisher={Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP},  author={Sakamoto, W. K.},  year={2003},  pages={49–53} }