Comments on the hyperfine fields at B nuclei in CeB6

It is pointed out that the hyperfine field at B nuclei in CeB6 is attribute d to the dipole-dipole interaction of the nuclear moment with the magnetic moments of Ce ions and the transferred hyperfine interaction due to the 2s and 2p states of B ion hybridized with the 4f states of Ce ions. Both contr ibutions have the same order of magnitude, and account for the hyperfine fi elds in the antiferro-quadrupolar ordering phase II and the paramagnetic ph ase I.