\begin{thebibliography}{10}

\bibitem{matsubara:1956}
Matsubara T. and Matsudu H.
\newblock Letters to the editor, {A} lattice model for liquid {H}elium.
\newblock {\em Progress of Theoretical Physics}, {\bf{16}}:416 -- 417, 1956.

\bibitem{matsubara:1956b}
Matsubara T. and Matsudu H.
\newblock A lattice model for liquid {H}elium, {I}.
\newblock {\em Progress of Theoretical Physics}, {\bf{16}}(6):569 -- 582, 1956.

\bibitem{toth:1990}
T{\'o}th B.
\newblock Phase transition in an interacting {B}ose system. an application of
  the theory of {V}entsel' and {F}reidlin.
\newblock {\em Journal of Statistical Physics}, {\bf{61}}(3/4):749 -- 764,
  1990.

\bibitem{penrose:1991}
Penrose O.
\newblock {B}ose-{E}instein condensation in an exactly soluble system of
  interacting particles.
\newblock {\em Journal of Statistical Physics}, {\bf{63}}(3/4):761 -- 781,
  1991.

\bibitem{toth:1991}
T{\'o}th B.
\newblock Upper bound in the condensate in the hard-core lattice gas.
\newblock {\em Journal of Statistical Physics}, {\bf{65}}(1/2):373 -- 378,
  1991.

\bibitem{angelescu:1992}
Angelescu N. and Bundaru M.
\newblock A remark on the condensation in a hard-core lattice gas.
\newblock {\em Journal of Statistical Physics}, {\bf{69}}(3/4):897 -- 903,
  1992.

\bibitem{kennedy:1988}
Kennedy T., Lieb~E. H., and Shastry S.
\newblock The {XY}-model has longe-range order for all spins and all dimensions
  greater than one.
\newblock {\em Physical Review Letters}, {\bf{61}}:2582 -- 2584, 1988.

\bibitem{fannes:1980}
Fannes M., Spohn H., and Verbeure A.
\newblock Equilibrium states for mean-field models.
\newblock {\em Journal of Mathematical Physics}, {\bf{21}}(2):355 -- 358, 1980.

\bibitem{michoel:1999b}
Michoel T. and Verbeure A.
\newblock {G}oldstone boson normal coordinates in interacting {B}ose gases.
\newblock {\em Journal of Statistical Physics}, {\bf{96}}(5/6):1125 -- 1162,
  1999.

\bibitem{michoel:2000}
Michoel T. and Verbeure A.
\newblock Goldstone boson normal coordinates.
\newblock {\em Preprint KUL-TF-2000/02}, 2000.
\newblock arXiv: math-ph/0001033.

\bibitem{goderis:1989}
Goderis D., Verbeure A., and Vets P.
\newblock Non-commutative central limits.
\newblock {\em Probability Theory and Related Fields}, {\bf{82}}:527 -- 544,
  1989.

\bibitem{goderis:1990}
Goderis D., Verbeure A., and Vets P.
\newblock Dynamics of fluctuations for quantum lattice systems.
\newblock {\em Communications in Mathematical Physics}, {\bf{128}}:533 -- 549,
  1990.

\bibitem{wright:1997}
Wright~E. M.
\newblock Collapses and revivals in the interference between two
  {B}ose-{E}instein condensates.
\newblock {\em Physical Review A}, {\bf{56}}:591 -- 602, 1997.

\bibitem{wang:1999}
Wang~X. G., Pan~S. H., and Yang~G. Z.
\newblock Interference intensity in two {B}ose-{E}instein condensates with
  {J}osephson-like coupling.
\newblock {\em Physica A}, {\bf{274}}:484 -- 490, 1999.

\end{thebibliography}