[1] Inouye S, Chikkatur A P, Stamper-Kurn D M, Stenger J,
Pritchard D E and Ketterle W 1999 Science 285 571

[2]Schneble D, Torii Y, Boyd M, Streed E W, Pritchard D E and
Ketterle W 2003 Science 300 475

[3]Kozuma M et al %, Suzuki Y, Torii Y, Sugiura T, Kuga T, Hagley E W and
%Deng L
1999 Science 286 2309

[4]Yoshikawa Y et al %, Sugiura T, Torii Y and Kuga T
2004 Phys. Rev. A 69 041603(R)

[5]Schneble D, Campbell G K, Streed E W, Boyd M, Pritchard D E and
Ketterle W 2004 Phys. Rev. A 69 041601(R)

[6]Fallani L et al %, Fort C, Piovella N, Cola M, Cataliotti F S, Inguscio
%M and Bonifacio R
2005 Phys. Rev. A 71 033612

[7]Yoshikawa Y, Torii Y and Kuga T 2005 Phys. Rev. Lett.
94 083602

[8]Moore M G and Meystre P 1999 Phys. Rev. Lett. 83 5202

[9]Ozgur E M and You L 2000 Phys. Rev. A 62 063615

[10]Pu H, Zhang W P and Meystre P 2003 Phys. Rev. Lett.
91 150407

[11]Cola M M and Piovella N 2004 Phys. Rev. A 70 045601

[12]Shamrov N I 2006 Opt. Spectrosc. 100 91

[13]Zobay O and Nikolopoulos M G 2006 Phys. Rev. A 73 013620

[14]Lambert N, Emary C and Brandes T 2004 Phys. Rev. Lett.
92 073602

[15]Stam K M R arXiv: 0707.1465
Bar-Gill N, Rowen E E and Davidson N arXiv:0705.2518

[16]Burger S et al %, Bongs K, Dettmer S, Ertmer W and Sengstock K
1999 Phys. Rev. Lett. 83 5198