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Zaphiris, P., Shneiderman, B., & Norman, K. L. (1999). Expandable indexes versus sequential menus for searching hierarchies on the world wide web. Human-Computer Interaction Laboratory Technical Report HCIL-99-15. College Park, MD: University of Maryland.
ftp://ftp.cs.umd.edu/pub/hcil/Reports-Abstracts-Bibliography/99-15html/99-15.php
PDF: http://www.soi.city.ac.uk/~zaphiri/Papers/expandableindexes.pdf