Contribution from stars stripped in binaries to cosmic reionization of hydrogen and helium Y. Götberg, S. E. de Mink, M. McQuinn, E. Zapartas, J. H. Groh and C. Norman A&A, 634 (2020) A134 Published online: 25 February 2020 DOI: 10.1051/0004-6361/201936669