Festila, L., L. Szolga, S. Hintea, and M. Cirlugea. “A Unitary View Toward Analog Weighting/Amplifying F-F-1 Cells”. Elektronika Ir Elektrotechnika, vol. 106, no. 10, Nov. 2010, pp. 21-26, https://eejournal.ktu.lt/index.php/elt/article/view/9111.