The interstellar extinction to V4334 Sgr (Sakurai's object) A. Evans, T. R. Geballe, B. Smalley, V. H. Tyne and S. P. S. Eyres A&A, 394 3 (2002) 971-974 Published online: 21 October 2002 DOI: 10.1051/0004-6361:20021229