LOW TEMPERATURE THERMAL CONDUCTIVITY OF TWO NATURAL DIAMONDS : ANISOTROPIC HEAT CONDUCTION IN THE BOUNDARY SCATTERING REGIME J. W. VandersandeJ. Phys. Colloques, 39 C6 (1978) C6-1017-C6-1018DOI: https://doi.org/10.1051/jphyscol:19786449