More Karl Voit: (1) "Managing Digital Files (e.g., Photographs) in Files and Folders" at https://karl-voit.at/managing-digital-photographs/

(2) "TagTrees: Improving Personal Information Management Using Associative Navigation" at https://karl-voit.at/tagstore/en/papers.shtml

(3) "TagTree: Storing and Re-finding Files Using Tags" at https://karl-voit.at/tagstore/downloads/Voit2011.pdf