Caught in the act: A helium-reionizing quasar near the line of sight to Q0302-003 P. Jakobsen, R. A. Jansen, S. Wagner and D. Reimers A&A, 397 3 (2003) 891-898 Published online: 21 January 2003 DOI: 10.1051/0004-6361:20021579