by Beausang, C W, Fallon, P, Appelbe, D E, Aztalos, S, Clark, R M, Clarke, S, Cederwall, Bo, Deleplanque, M A, Diamond, R M, Erturk, S, Kelly, W, Lee, I Y, Macchaivelli, A O, Patterson, D C, Smith, M B, Stephens, F S, Twin, P J, Wilson, A N
Published in Physics letters. B (15.01.1998)