Balaišis, P., R. Gužauskas, D. Eidukas, and A. Valinevičius. “Directions of Efficiency Research for Biotronics Technologies”. Elektronika Ir Elektrotechnika, vol. 89, no. 1, Jan. 2009, pp. 49-54, https://eejournal.ktu.lt/index.php/elt/article/view/10564.