On the anomalous torque applied to a rotating magnetized sphere in a   vacuum
  We analyze the torque applied to a rotating magnetized sphere in a vacuum. It is shown that for the correct determination of one of the torque's component the angular momentum of the electromagnetic field within the body should be taken into account. 
V.S.Beskin, A.A.Zheltoukhov
astro-ph.HE gr-qc