The optical counterpart of IGR J00291+5934 in quiescence P. D'Avanzo, S. Campana, S. Covino, G. L. Israel, L. Stella and G. Andreuzzi A&A, 472 3 (2007) 881-885 Published online: 23 July 2007 DOI: 10.1051/0004-6361:20077395