by Morris, C.L., Zumbro, J.D., McGill, J.A., Seestrom, S.J., Whitton, R.M., Reidel, C.M., Williams, A.L., Braunstein, M.R., Kohler, M.D., Kriss, B.J., Høibråten, S., Ouyang, J., Peterson, R.J., Wise, J.E.
Published in Physics letters. B (12.02.1998)