QCD corrections up to order alpha_s^2 to polarized quark production in e^+ e^- -annihilation

Abstract

The revised version contains two additional references i.e. [13], [14] w.r.t. to the original paper. Furthermore Eq. (33) in [11] at the end of the paragraph below (3.17) must be Eq. (33) in [10]. Misprints in the list of references are corrected.

Comments: 44 pages, LaTeX, 9 Postscript figures