Ojarand, J., P. Annus, R. Land, T. Parve, and M. Min. 2010. “Nonlinear Chirp Pulse Excitation for the Fast Impedance Spectroscopy”. Elektronika Ir Elektrotechnika 100 (4):73-76. https://eejournal.ktu.lt/index.php/elt/article/view/9880.