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3. W. A. Harrison, Pseudopotentials in the Theory of Metals, Benjamin, Reading, Mass. (1966).
4. R. M. Martin, Electronic Structure, Basic Theory and Practical Methods, Cambridge University Press, Cambridge (2004).
5. D. A. Papaconstantopoulos, Handbook of the Band Structure of Elemental Solids, Plenum Press, New York (1986).