This release contains the quadratic multiple knapsack problem instances created from the Billionnet data set [1].
[1] Alain Billionnet and Eric Soutif. "Using a Mixed Integer Programming Tool for Solving the 0-1 Quadratic Knapsack Problem", INFORMS J. on Comput vol. 16(2): 188-197, 2004. See also https://cedric.cnam.fr/~soutif/QKP/QKP.html