LONGITUDINAL FIELD µSR IN CuMn SPIN GLASSES BELOW Tf H. Pinkvos, F. N. Gygax, E. Lippelt and Ch. Schwink J. Phys. Colloques, 49 C8 (1988) C8-1035-C8-1036 DOI: 10.1051/jphyscol:19888472