MathSciNet bibliographic data MR344228 12A70 (10H10) Chowla, S.; Hartung, P. A note on the hypothesis that $L(s,\chi )>0$$L(s,\chi )>0$ for all real non-principal characters $\chi$$\chi$ and for all $s>0$$s>0$. J. Number Theory 6 (1974), 271–275. Article

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