Herencsar, N., R. Sotner, J. Koton, J. Misurec, and K. Vrba. 2013. “New Compact VM Four-Phase Oscillator Employing Only Single Z-Copy VDTA and All Grounded Passive Elements”. Elektronika Ir Elektrotechnika 19 (10):87-90. https://doi.org/10.5755/j01.eee.19.10.5900.