The 2000 outburst of the recurrent nova CI Aquilae: Optical spectroscopy L. L. Kiss, J. R. Thomson, W. Ogloza, G. Fűrész and K. Sziládi A&A, 366 3 (2001) 858-864 Published online: 15 February 2001 DOI: 10.1051/0004-6361:20010015