by Woodward, CE, Beise, EJ, Belz, JE, Carr, RW, Filippone, BW, Lorenzon, WB, McKeown, RD, Mueller, B, O'Neill, TG, Dodson, G, Dow, K, Farkhondeh, M, Kowalski, S, Lee, K, Makins, N, Milner, R, Thompson, A, Tieger, D, van den Brand J, Young, A, Yu, X, Zumbro, J
Published in Physical review letters (06.08.1990)