Letter of interest for a neutrino beam from Protvino to KM3NeT/ORCA A. V. Akindinov, E. G. Anassontzis, G. Anton, M. Ardid, J. Aublin, B. Baret, V. Bertin, S. Bourret, C. Bozza, M. Bruchner et al. (81 more) Eur. Phys. J. C, 79 9 (2019) 758 Published online: 12 September 2019 DOI: 10.1140/epjc/s10052-019-7259-5