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References
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This can be proved in the classical case, at least, by a conformal transformation. See [3].
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Differences between (24) and [26] and [18] do not change this conclusion.
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Bernard, C. (1980). Physical effects of instantons. In: Harnad, J.P., Shnider, S. (eds) Geometrical and Topological Methods in Gauge Theories. Lecture Notes in Physics, vol 129. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0024133
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