Strict bounds for out-of-band frequencies due to impurities and defects in solids

The algebraic eigenvalue problem

1965 • 5,953 citations

On the Upper and Lower Bounds of Eigenvalues

1949 • 257 citations

Atomic Vibrations in Solids

1967 • 52 citations

The accuracy of Rayleigh’s method of calculating the natural frequencies of vibrating systems

1952 • 44 citations

Approximate calculation of frequencies of localized vibrations

1961 • 12 citations