Atanas Hikov, Zlatka Milakovska, Valentina Lyubomirova, Nadezhda Lihareva. CRITICAL ELEMENTS IN SEQUENTIAL LEACHED PHASES FROM DEEP-SEA POLYMETALLIC NODULES AND SEDIMENTS. 24th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2024, Science and Technologies in Geology, Exploration And Mining, Vol 24, Issue 1.1, 2024, pp. 37-44. https://doi.org/10.5593/sgem2024/1.1/s01.05