[1]
R. Sotner, J. Jerabek, T. Dostal, and K. Vrba, “Z-copy Voltage Controlled Current Follower Differential Input Transconductance Amplifier in Controllable Biquadratic Band-Pass Filter”, ELEKTRON ELEKTROTECH, vol. 22, no. 4, pp. 32 - 36, Aug. 2016.