@article{vanVliet:20193J, author = "van Vliet, Arjen and Alves Batista, Rafael and Hörandel, Jörg R.", title = "{Current constraints from cosmogenic neutrinos on the fraction of protons in UHECRs}", doi = "10.22323/1.358.1025", journal = "PoS", year = 2019, volume = "ICRC2019", pages = "1025" }