https://qaplib.mgi.polymtl.ca/> (updated 2018) and <https://coral.ise.lehigh.edu/data-sets/qaplib/> (updated 2011), including the benchmark instances, on visited 2023-10-21.
Rainer E. Burkard, Stefan E. Karisch, and Franz Rendl. QAPLIB - A Quadratic Assignment Problem Library. Journal of Global Optimization. 10:391-403, 1997. https://doi.org/10.1023/A:1008293323270.