Harmonic Analysis on the Positive Rationals II: Multiplicative Functions   and Maass Forms
  This is the second of two coupled papers estimating the mean values of multiplicative functions, of unknown support, on arithmetic progressions with large differences. Applications are made to the study of primes in arithmetic progression and to the Fourier coefficients of automorphic cusp forms. 
P. D. T. A. Elliott, Jonathan Kish
math.NT