QPLIB: A library of quadratic programming instances - Furini, Fabio; Traversi, Emiliano; Belotti, Pietro; Frangioni, Antonio; Gleixner, Ambros; Gould, Nick; Liberti, Leo; Lodi, Andrea; Misener, Ruth; Mittelmann, Hans; Sahinidis, Nikolaus V.; Vigerske, Stefan; et al. (Mathematical Programming Computation, 2019)