1. SHiP collaboration, A facility to Search for Hidden Particles (SHiP) at the CERN SPS, arXiv:1504.04956 [INSPIRE].
2. S. Alekhin et al., A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case, Rept. Prog. Phys.
79 (2016) 124201 [arXiv:1504.04855] [INSPIRE].
3. DONUT collaboration, Observation of τ neutrino interactions, Phys. Lett.
B 504 (2001) 218 [hep-ex/0012035] [INSPIRE].
4. DONuT collaboration, Final τ -neutrino results from the DONuT experiment, Phys. Rev.
D 78 (2008) 052002 [arXiv:0711.0728] [INSPIRE].
5. OPERA collaboration, Recent results of the OPERA experiment, AIP Conf. Proc.
1743 (2016) 060004 [INSPIRE].