Bush (1945)As We May Think...associative trails...MemexGarfield, 1955citation index...authority by citation...Salton & McGilltf·idfNelson, T. (1965)XanaduhypertextBerners-Lee (1989)...the web as a graph...Brin & Page (1998)PageRank...link as citation...Vaswani et al. (2017)Attention Is All You Need...transformer...Devlin et al. (2018)BERTLewis et al. (2020)RAG...retrieve, then generate......the cited source wins...entity disambiguation{ AEO }...answer before the click...cf. PageRank → AEO§ answer passage retrieval[1]