by Bhanja, R, Joseph, R, Tuli, SK, Beri, SB, Bhatia, VS, Kaur, G, Kaur, M, Mittra, IS, Bhalla, KB, Bharti, A, Lokanathan, S, Gupta, SK, Gupta, VK, Kaul, GL, Kumar, V, V, Mangotra, LK, Prakash, Y, Rao, NK, Sankhydhar, S, Satti, S, Claesson, G, Garpman, S, Herrström, NY, Jakobsson, B, Lund, I, I, Norén, B, Oskarsson, A, Otterlund, I, I, Persson, S, Sherif, MM, Söderström, K
Published in Physical review letters (25.02.1985)