Resistor-less current-mode universal biquad filter using CCTAs and grounded capacitors. Thosdeekoraphat, T, Summart, S, Saetiaw, C, Santalunai, S, & Thongsopa, C International Journal of Electronics and Communication Engineering, 6(9):940–944, 2012.
bibtex   
@article{thosdeekoraphat2012resistor,
  title={Resistor-less current-mode universal biquad filter using CCTAs and grounded capacitors},
  author={Thosdeekoraphat, T and Summart, S and Saetiaw, C and Santalunai, S and Thongsopa, C},
  journal={International Journal of Electronics and Communication Engineering},
  volume={6},
  number={9},
  pages={940--944},
  year={2012}
}

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