Wai, M. P. P. ., W. jaikla, S. . Siripongdee, A. . Chaichana, and P. Suwanjan. “Electronically Tunable TISO Voltage-Mode Universal Filter Using Two LT1228s”. International Journal of Engineering and Technology Innovation, vol. 12, no. 1, Dec. 2021, pp. 62-74, doi:10.46604/ijeti.2021.8499.