Ley Koo, E., and M. Rosales. “Electromagnetic Fields from High Frequency Currents Harmonically Distributed on Infinitely Long Circular Cylinders”. Revista Mexicana De Física E, vol. 50, no. 2 Jul-Dec, Jan. 2004, pp. 140-6, https://rmf.smf.mx/ojs/index.php/rmf-e/article/view/4475.