Electrical solitary waves on a transmission line periodically loaded with resonant tunneling diodes using some different methodsM. Meli Dzoyem, A. D. Mengue and B. Z. EssimbiEur. Phys. J. Plus, 138 5 (2023) 431DOI: https://doi.org/10.1140/epjp/s13360-023-04045-7