Verification benchmarks for single-phase flow in three-dimensional fractured porous media. - Inga Berre; Wietse M. Boon; Bernd Flemisch; Alessio Fumagalli; Dennis Gläser; Eirik Keilegavlen; Anna Scotti; Ivar Stefansson; Alexandru Tatomir; Konstantin Brenner; Samuel Burbulla; Philippe R. B. Devloo; et al. (CoRR, 2020)