Ojarand, J., and M. Min. “Simple and Efficient Excitation Signals for Fast Impedance Spectroscopy”. Elektronika ir Elektrotechnika 19, no. 2 (February 7, 2013): 49-52. Accessed July 13, 2020. http://eejournal.ktu.lt/index.php/elt/article/view/3468.