Model-independent constraints on contact interactions from LEP2 data analysis A.A. Babich, G. Della Ricca, J. Holt, P. Osland, A.A. Pankov and N. Paver Eur. Phys. J. C, 29 1 (2003) 103-109 Published online: 13 May 2003 DOI: 10.1140/epjc/s2003-01206-5