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Finally, it is noteworthy that type II superconductors were, in fact, discovered in the late 1930s, although it took two decades to make things clear. Namely, in 1935-36, LV Shubnikov and his co-authors revealed the behavior of some alloys in a magnetic field, typical of type II superconductors (for the explanation and references see books [8, 10]; previously we have referred, although implicitly, to type I superconductors).3