| VHF - UHF - MW Newsletter - IARU Region 1 - 2020 r. |
| VHF - UHF - MW Newsletter - IARU Region 1 - 2020 r. 85 Edycja 2 March 2020 https://www.iaru-r1.org/wp-content/uploads/2020/03/Newsletter85.pdf https://translate.google.pl/translate?hl=pl&sl=en&tl=pl&u=https%3A%2F%2Fwww.iaru-r1.org%2Fwp-content%2Fuploads%2F2020%2F03%2FNewsletter85.pdf |