"Estados Unidos National Bureau of Standards." . . "Ferromagnetismo." . . . . "Some properties of the eigenfunctions and eigenvalues introduced by Bethe for the linear chain of atoms" . "Some properties of the eigenfunctions and eigenvalues introduced by Bethe for the linear chain of atoms"@en . . . . . . . . . . . . "Some properties of the eigenfunctions adn eigenvalues introduced by Bethe for the linear chain of atoms" . . . . . . "Some properties of the Eigenfunctions and Eigenvalues introduced by Bethe for the linear chain of atoms"@en . . .