MgB2: synthesis, sound velocity, and dynamics of the vortex phase
  The sound velocity is measured in polycrystalline MgB2 synthesized from the elements, and the bulk modulus and the Debye temperature are calculated. The conversion of an elastic wave into electromagnetic radiation is investigated in the mixed state.The dynamic parameters of the vortex lattice are estimated. This paper was published in Low Temp. Rhys., 2002, v.28, N3, p.270-274 
T.V.Ignatova, G.A.Zvyagina, I.G.Kolobov, E.A.Masalitin, V.D.Fil',   Yu.V.Paderno, A.N.Bykov, V.N.Paderno, and V.I.Lyashenko