QPLIB: a library of quadratic programming instances. - Fabio Furini; Emiliano Traversi; Pietro Belotti; Antonio Frangioni; Ambros M. Gleixner; Nick Gould; Leo Liberti; Andrea Lodi 001; Ruth Misener; Hans D. Mittelmann; Nikolaos V. Sahinidis; Stefan Vigerske; et al. (Math. Program. Comput., 2019)