What would be a good source to learn the Deuring-Heilbronn phenomenon?

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I was trying to read from the book "Ten Lectures on the Interface Between Analytic Number Theory and Harmonic Analysis" by Montgomery. However, I found the text highly condense and difficult to read, probably because it's in the form of lecture notes. Can anyone please suggest a more manageable source for the Deuring-Heilbronn phenomenon and zero-repulsion as such?