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The publication of a revised edition of a monograph devoted to the two-bandtheory of superconductivity provides us the opportunity of a short comment ontwo classical papers, published independently some 50 years ago, where thegeneralization of the BCS theory for metals with overlapping energy bands atthe Fermi level has been proposed. The article includes Moskalenko'srecollections on some aspects of scientific life in the Soviet Union, in the'50s.

The two-band theory of superconductivity turns 50