Boyarsky has already answered the question in the comments section. These are a couple of expositions which put John Tate's contribution in perspective.

1. Stephen Kudla's chapter on Tate's thesis
2. Stephen Gelbart's article on Elementary introduction to Langland's program. See the section beginning page 194

Boyarsky has already answered the question in the comments section. These are a couple of expositions which put John Tate's contribution in perspective.

1. Stephen Kudla's chapter on Tate's thesis
2. Stephen Gelbart's article on Elementary introduction to Langlands' program. See the section beginning page 194