@article{weko_4830_1, author = "Ito,Toshiaki and Matsuda,Masahisa and Matsui,Yoshimitsu", title = "New possibility of solving the problem of lifetime ratio τ(Λ_b ) / τ(B_d)", journal = "Progress of theoretical physics", year = "1998", volume = "99", number = "2", pages = "271--280" }