Avalanche Beacons operating at 457 kHz; Transmitter-receiver systems; -- Part 2: Harmonised Standard for features for emergency services (ETSI EN 300 718-2 V2.1.1 (2018-01))
33.030 Telecommunication. Including supplementary services, service aspects and associated legal tracability aspects / Телекоммуникационные услуги. Применение. Включая дополнительные услуги и аспекты обслуживания
