D. R. Heath-Brown, “Zero-Free Regions for Dirichlet L-Functions and the Least Prime in an Arithmetic Progressions,” Proceedings of the London Mathematical Society, Vol. 64, No. 2, 1992, pp. 265-338.
http://dx.doi.org/10.1112/plms/s3-64.2.265

has been cited by the following article:

• TITLE: Primes in Arithmetic Progressions to Moduli with a Large Power Factor

  AUTHORS: Ruting Guo

  KEYWORDS: Primes; Arithmetic Progressions; Riemann Hypothesis

  JOURNAL NAME: Advances in Pure Mathematics, Vol.3 No.7A, October 30, 2013

  ABSTRACT: Recently Elliott studied the distribution of primes in arithmetic progressions whose moduli can be divisible by highpowers of a given integer and showed that for integer a≥2 and real number A＞0. There is a B=B(A)＞0 such that , holds uniformly for moduli that are powers of a. In this paper we are able to improve his result.