https://www.impan.pl/en/publishing-house/journals-and-series/acta-arithmetica/all/en/publishing-house/journals-and-series/acta-arithmetica/all/116/1/83704/nonvanishing-of-fourier-coefficients-of-newforms-in-progressions
Nonvanishing of Fourier coefficients of newforms in progressionsAll
fouriercoefficients