Herencsar, N., R. Sotner, J. Koton, J. Misurec, and K. Vrba. “New Compact VM Four-Phase Oscillator Employing Only Single Z-Copy VDTA and All Grounded Passive Elements”. Elektronika ir Elektrotechnika 19, no. 10 (December 10, 2013): 87–90. Accessed February 8, 2026. https://eejournal.ktu.lt/index.php/elt/article/view/5900.