Constraints on the IR behaviour of gluon and ghost propagator from Ward-Slavnov-Taylor identities Ph. Boucaud, J. P. Leroy, A. Le Yaouanc, A. Y. Lokhov, J. Micheli, O. Pène, J. Rodríguez-Quintero and C. Roiesnel Eur. Phys. J. A, 31 4 (2007) 750-753 Published online: 20 March 2007 DOI: 10.1140/epja/i2006-10295-1