discussion: <A HREF="http://www.dms.umontreal.ca/~andrew/PDF/Equidist1.pdf">Limitations to the equidistribution of primes</A> (Friedlander and Granville, 1989) and <A HREF="http://www.ams.org/journals/bull/2007-44-01/S0273-0979-06-01142-6/S0273-0979-06-01142-6.pdf">Small gaps between prime numbers</A> (Soundararajan, 2007) (page 16).

the sources to Montgomery are

*Topics in multiplicative number theory* (Springer, 1971)

Proc. Symp. Pure Math. **28**, 307 (1976)