Elias Ansariy, Olga Gryukach, and Amirzhan Urazbekov. “LoRaWAN: A Mathematical Study of Simple-Signal Modulation Transforms and Realizing CSS (Chirp Spread Spectrum) by Means of FM”. Research Reviews, no. 13, June 2026, https://ojs.publisher.agency/index.php/RR/article/view/8971.