A Survey on Earth Observation Multimodal Large Language Models: Framework, Core Technologies, and Future Perspectives. - XU, Wenjia; YU, Ruiqing; XUE, Minghao; WANG, Xueyi; ZHANG, Yuanben; WEI, Zhiwei; ZHANG, Zhe; PENG, Mugen; WU, Yirong (Journal Of Radars / Leida Xuebao, 2026)