00408nam a2200133Ia 4500082002000000100004200020245004700062260003500109300002600144490005500170500000500225700003700230856000700267  a515.72bEg31.OS  aEgorov, Yuri and Kondratiev, Vladimir  aOn spectral theory of elliptic operatorsb  aBaselbBirkhauser Verlagc1996  ax, 328p. Index, Bibl.  aOperator theoryvadvances and applications ; v. 89  a  aKondratiev, Vladimir ; jt. auth.  df