by Belkacem, A, Bologna, G, Chevallier, M, Cue, N, Gaillard, M. J, Genre, R, Kimbali, J. C, Kirsch, R, Marsh, B. B, Peigneux, J. P, Poizat, J. C, Remillieux, H, Sillou, D, Spighel, M, Sun, C. R
Published in Europhysics letters (01.04.1988)