Skrbek, Jan. “RADIO-HELP AS A SMART EARLY WARNING AND NOTIFICATION SYSTEM”. Proceedings of the 55th Annual Meeting of the ISSS - 2011, Hull, UK 55, no. 1 (September 23, 2011). Accessed May 8, 2024. https://journals.isss.org/index.php/proceedings55th/article/view/1723.