Three-flavour oscillations with accelerator neutrino beams.

The three-flavor neutrino oscillation paradigm is well established in particle physics thanks to the crucial contribution of accelerator neutrino beam experiments. In this paper we review the most important contributions of these experiments to the physics of massive neutrinos after the discovery of \theta_{13}and future perspectives in such a lively field of research. Special emphasis is given to the technical challenges of high power beams...