VALENTIN, M., and R. E. ELCHEIKH. “Investigations on Dielectric Resonators for Applications below 1 GHz”. Archives of Acoustics 16, no. 1 (May 1, 2014): 127–136. Accessed April 25, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1216.