Physics Letters B
Physics Letters B > 1998 > 418 > 1-2 > 167-172
Physics Letters B > 1998 > 424 > 3-4 > 235-243
Physics Letters B > 1998 > 429 > 1-2 > 111-120
Physics Letters B > 1998 > 441 > 1-4 > 9-16
Physics Letters B > 1998 > 443 > 1-4 > 33-39