PRECISION DETERMINATION OF EXCHANGE STRENGTHS IN MAGNETIC DIMERS VIA BIREFRINGENCE C. P. Landee, K. A. Reza et J. J. M. WilliamsJ. Phys. Colloques, 49 C8 (1988) C8-1511-C8-1512DOI: https://doi.org/10.1051/jphyscol:19888696