PINN-AMF: A physics-informed neural network with attention-based multi-source fusion for robust chlorophyll retrieval from UAV hyperspectral imagery - Mingbo Bian; Jibo Yue; Riqiang Chen; Yiguang Fan; Yanpeng Ma; Jiejie Fan; Zitai Zhang; Yang Liu; Guijun Yang; Haikuan Feng; Chunjiang Zhao (Computers and Electronics in Agriculture, 2026)