Diophantine Geometry: An Introduction – Marc Hindry, Joseph H. Silverman – Google Books

https://books.google.com/books?id=zfRWBQAAQBAJ&pg=PA301&lpg=PA301&dq=dirichlet+estimate+1/q%5E2&source=bl&ots=V77zU5RsGc&sig=j6ywUzQ0LUWANsUJg1EnM81OirA&hl=en&sa=X&ved=0ahUKEwj70e3tipDSAhXCqVQKHVLaDckQ6AEIHTAI#v=onepage&q=dirichlet%20estimate%201%2Fq%5E2&f=false

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