\begin{thebibliography}{99}
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi
\expandafter\ifx\csname urlprefix\endcsname\relax\def\urlprefix{URL }\fi

\bibitem{bib1}
A.~Coalman, D.~Fiedler and G.~Hughes, {\it Rev. Mod. Phys.\/} {\bf 63} (1991)
  545.

\bibitem{bib2}
G.~Banderer and S.~Mikhalchuk, {\it Phys. Lett.\/} {\bf B54} (1983) 387; {\it
  Sov. J. Nucl. Phys.} {\bf 19} (1979) 197.

\bibitem{bib3}
D.~Heinemann and U.~S{\o}renmann, {\it Phys. Rev. Lett.\/}  (2001).
  [hep-ph/0123456].

\bibitem{bib4}
T.~Czukor and J.~Zel\'enyi, {\it Acta Phys. Hung. A\/} {\bf 24} (2005) 345.

\bibitem{bib5}
I.~Mileev, K.~Plummer and M.~Gorentchev, {\it Int. J. Mod. Phys.\/} {\bf A11}
  (1995) 77.

\bibitem{bib6}
S. Trottman and G. Karib, {\it Proceedings of the 5th Workshop on High Energy
  Collision Phenomena}, August 2--6, 1993, eds. J.-P. Condrieu and
  P.~Ch\^{a}teau-Simone, 1994, Springer, p. 324.

\bibitem{bib7}
W.T. Fogg, Talk presented at {\it Advanced Research Workshop on Hot Hadronic
  Matter: Theory and Experiment}, 1994, Barcelona, June 29 -- July 1, to be
  published in the Proceedings by Plenum Press.

\bibitem{bib8}
This was not seen in [6].

\bibitem{bib9}
From Eq.~(\ref{eq2}) one sees that in the original frame the cross term is
  given by: $$ Q_{\perp L}^2 = \left( <x\;\tau\;{\rm sh}\eta'>- <x><\tau\;{\rm
  sh}\eta'>\right) $$ up to small logarithmic corrections. This clearly
  vanishes as soon as the source becomes reflection symmetric under $\eta' = -
  \eta'$.

\end{thebibliography}
