Dual-Signal Direct Time-of-Flight Method for Long-Range Groundwater Level Monitoring in Observation Wells. - Buriboev, Abror Shavkatovich; Rajabov, Farkhat; Djumanov, Jamoljon; Jamolov, Khudoyorkhon; Abduvaitov, Akmal; Azamov, Temur; Rahmatullayev, Ilhom; Lee, Cheolwon (Sensors (14248220), 2026)