Roy, Suvajit, Tapas Kumar Paul, Saikat Maiti, and Radha Raman Pal. “Voltage Differencing Current Conveyor Based Voltage-Mode and Current-Mode Universal Biquad Filters With Electronic Tuning Facility”. International Journal of Engineering and Technology Innovation 11, no. 2 (April 1, 2021): 146–160. Accessed March 29, 2024. https://ojs.imeti.org/index.php/IJETI/article/view/6821.