1. H-n. Li, Report No. hep-ph/9811340.
2. Back-to-back jets in QCD
3. H-n. Li, Phys. Lett. B 369 (1996) 137; Phys. Rev. D 55 (1997) 105.
4. N. Kidonakis, G. Oderda, G. Sterman, Report No. hep-ph/9801268; E. Laenen, G. Oderda, G. Sterman, Report No. hep-ph/9806467.
5. H.L. Lai and H-n. Li, to appear in Phys. Rev. D.