Renormalization scheme and higher loop stability in hadronic τ decay within analytic perturbation theory K.A. Milton, I.L. Solovtsov, O.P. Solovtsova and V.I. Yasnov Eur. Phys. J. C, 14 3 (2000) 495-501 Published online: 06 April 2000 DOI: 10.1007/s100520000370