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3. N. W. Ashcroft and N. D. Mermin, Solid State Physics (Thomson Learning, Orlando, 1976), p. 512.
4. D. R. Lovett, Semimetals & Narrow-bandgap Semiconductors (Pion, London, 1977), p. 61.
5. Growth of stoichiometric Cu3N thin films by reactive magnetron sputtering