R.D. Field, <i>Applications of Perturbative QCD</i>, Addison-Wesley, 1995.
Y. Zhang, G. Fai, G. Papp, G.G. Barnaföldi and P. Lévai, <i>Phys. Rev. C</i><b>65</b> (2002) 034903.
G. Papp, P. Lévai and G. Fai, <i>Phys. Rev. C</i><b>61</b> (2000) 021902(R).
J.W. Cronin et al., <i>Phys. Rev. D</i><b>11</b> (1975) 3105.
F. Aversa, M. Greco, P. Chiappetta and J.P. Guillet, <i>Z. Phys. C</i><b>46</b> (1990) 253; ibid. <i>C</i><b>49</b> (1991) 459.
R.K. Ellis and J.C. Sexton, <i>Nucl. Phys. B</i><b>269</b> (1986) 445.
M.A. Kimber, A.D. Martin and M.G. Ryskin, <i>Eur. Phys. J. C</i><b>12</b> (2000) 655; <i>Phys. Rev. D</i><b>63</b> (2001) 114027.
B.A. Kniehl, G. Kramer and B. Potter, <i>Nud. Phys. B</i><b>597</b> (2001) 337.
M. Glück, E. Reya and A. Vogt, <i>Z. Phys. C</i><b>53</b> (1992) 127.
X.N. Wang, <i>Phys. Rep.</i> 280 (1997) 287; <i>Phys. Rev. Lett.</i><b>81</b> (1998) 2655; <i>Phys. Rev. C</i><b>58</b> (1998) 2321.
C.Y. Wong and H. Wang, <i>Phys. Rev. C</i><b>58</b> (1998) 376.
C. Kourkoumelis et al. (R806 Collaboration), <i>Z. Phys. C</i><b>5</b> (1980) 95.
F.W. Büsser et al. (CCRS Collaboration), <i>Nucl. Phys. B</i><b>106</b> (1976) 1.
D.E. Jaffe et al. (E605 Collaboration), <i>Phys. Rev. D</i><b>40</b> (1989) 2777.
P.B. Straub et al., <i>Phys. Rev. Lett.</i><b>68</b> (1992) 452.
B. Alper et al. (ISR Collaboration), <i>Nucl. Phys. B</i><b>100</b> (1975) 237.
G. Arnison et al. (UA1 Collaboration), <i>Phys. Lett. B</i><b>118</b> (1983) 167.
C. Albajar et al. (UA1 Collaboration), <i>Nucl. Phys. B</i><b>335</b> (1990) 261.
G. Bocquet et al. (UA1 Collaboration), <i>Phys. Lett. B</i><b>366</b> (1996) 434.
F. Abe et al. (CDF Collaboration), <i>Phys. Rev. Lett.</i><b>61</b> (1988) 1819.
C.N. Brown et al., <i>Phys. Rev. C</i><b>54</b> (1996) 3195.
X.N. Wang and M. Gyulassy, <i>Phys. Rev. D</i><b>44</b> (1991) 3501.
K.J. Eskola, V.J. Kolhinen and C.A. Salgado, <i>Eur. Phys. J. C</i><b>9</b> (1999) 61.
M.D. Corcoran et al. (E609 Collaboration), <i>Phys. Lett. B</i><b>259</b> (1991) 209.
R. Albrecht et al. (WA80 Collaboration), <i>Phys. Lett. B</i><b>361</b> (1995) 14.
M.M. Aggarwal et al. (WA98 Collaboration), <i>Phys. Rev. Lett.</i><b>85</b> (2000) 3595; <i>Eur. Phys. J C</i><b>23</b> (2002) 225; nucl-ex/0006007.
W.A. Zajc (PHENIX Collaboration), <i>Nucl. Phys. A</i><b>698</b> (2002) 39c; G. David (PHENIX Collaboration), <i>Nucl. Phys. A</i><b>698</b> (2002) 227c.
J.W. Harris (STAR Collaboration), <i>Nucl. Phys. A</i><b>698</b> (2002) 64c.
D. Antreasyan et al., <i>Phys. Rev. D</i><b>19</b> (1979) 764.
G.G. Barnaföldi, G. Fai, P. Lévai, G. Papp and Y. Zhang, <i>J. Phys. G</i><b>27</b> (2001) 1767.
S.D. Ellis, Z. Kunszt and D.E. Soper, <i>Phys. Rev. Lett.</i><b>69</b> (1992) 1496.
Z. Kunszt and D.E. Soper, <i>Phys. Rev. D</i><b>46</b> (1992) 192.
P. Lévai, G. Papp, G. Fai, M. Gyulassy, G.G. Barnaföldi, I. Vitev and Y. Zhang, <i>Nucl. Phys. A</i><b>698</b> (2002) 631c.
