Long-slit spectrophotometry of the multiple knots of the polar ring galaxy IIZw71 E. Pérez-Montero, R. García-Benito, A. I. Díaz, E. Pérez and C. Kehrig A&A, 497 1 (2009) 53-63 Published online: 18 February 2009 DOI: 10.1051/0004-6361/200810984