"Yosuke Takasu,Kenichi Maki,Kaduki Komori,Tetsushi Takano,Kazuhito Honda,Mitsutaka Kumakura,Tsutomu Yabuzaki,Yoshiro Takahashi","Spin-Singlet Bose-Einstein Condensation of Two-Electron Atoms",,"PHYSICAL REVIEW LETTERS","The American Physical Society","Volume 91","Number 4","pp. 040404",2003,July