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J. F. Donoghue and B. R. Holstein, Phys. Rev. D25 (1982) 2015.

M. L. Cohen and P. W. Anderson, in Superconductivity in d- and f-Band Metals, ed. D. H. Douglas (AIP, New York, 1972).

H. Krebs, Fundamentals of Inorganic Crystal Chemistry (McGraw-Hill, London, 1968), p. 160.

It is preferred that references in the bibliography be cited in the text using a superscript number with a parenthese ; for example, if we cite the paper by Cohen and Anderson the reference number appears like this[2]. All references should include initials and last name of the author(s), title of publication (in italics), volume (in bold), year of publication of paper in the journal/book, and page numbers.

Stefano Lacaprara