On the excitation of the infrared knots along protostellar jets T. Giannini, C. McCoey, A. Caratti o Garatti, B. Nisini, D. Lorenzetti and D. R. Flower A&A, 419 3 (2004) 999-1014 Published online: 07 May 2004 DOI: 10.1051/0004-6361:20040087