@article{pernak_świerczyńska_walkiewicz_krystkowiak_maciejewski_2009,  title={Long alkyl chain bis-quaternary ammonium-based ionic liquids as biologically active xanthenes dyes},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000500006},  DOI={10.1590/S0103-50532009000500006},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Pernak, Juliusz and Świerczyńska, Anna and Walkiewicz, Filip and Krystkowiak, Ewa and Maciejewski, Andrzej},  year={2009},  pages={839–845} }