[1]
J. Jerabek, R. Sotner, T. Dostal, and K. Vrba, “Simple Resistor-less Generator Utilizing Z-copy Controlled Gain Voltage Differencing Current Conveyor for PWM Generation”, ELEKTRON ELEKTROTECH, vol. 21, no. 5, pp. 28–34, Oct. 2015, doi: 10.5755/j01.eee.21.5.13322.