@article{prasad_bhaskar_srivastava_2013, 
  title={Universal Current-Mode Biquad Filter Using a VDTA}, 
  volume={04}, 
  DOI={10.4236/cs.2013.41006}, 
  number={01}, 
  publisher={Scientific Research Publishing, Inc,}, 
  author={Prasad and Bhaskar and Srivastava}, 
  year={2013}
  }