Jerabek, J., R. Sotner, and K. Vrba. “Tunable Multiphase Oscillator Using Diamond Transistors With Voltage Controlled Condition of Oscillation for Amplitude Stabilization”. Elektronika Ir Elektrotechnika, vol. 20, no. 1, Jan. 2014, pp. 45-48, doi:10.5755/j01.eee.20.1.6166.