Top-quark pair production via polarized and unpolarized protons in the supersymmetric QCD Yu Zeng-Hui, Herbert Pietschmann, Ma Wen-Gan, Han Liang and Jiang Yi Eur. Phys. J. C, 9 3 (1999) 463-477 Published online: 28 May 1999 DOI: 10.1007/s100520050040