Magnetic excitations in the quantum spin system KCuCl3 N. Cavadini, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka Eur. Phys. J. B, 7 4 (1999) 519-522 Published online: 15 February 1999 DOI: 10.1007/s100510050642