Physics Letters B
Physics Letters B > 1998 > 435 > 3-4 > 303-311
Physics Letters B > 1998 > 436 > 1-2 > 91-96
Physics Letters B > 1998 > 439 > 1-2 > 29-36
Physics Letters B > 1998 > 444 > 1-2 > 156-162
Physics Letters B > 1999 > 445 > 3-4 > 296-306