00366nam a22001457a 450000500170000002000180001710000170003524500310005226000330008330000110011649000460012765000130017365000160018670000180020220260109145633.0  a9780126702309  aStewart, G W  aMatrix perturbation theory  aLondonbAcademic pressc2004  axv+365  aComputer science and scientific computing  aMatrices  aEigenvalues  aSun, Ji-guang