The 5 March 1979 soft gamma-ray repeater: a fresh outlook
  An attempt is made to explain the 8-second periodicity of the 5th March 1979 soft gamma-ray repeater as a consequence of the elastic wave precession in the rigid crust of the rotating neutron star. 
G.V. Vlasov (Moscow Aviat. Inst. and Landau Inst. for Theoret. Phys.)