MathSciNet bibliographic data MR660714 (83i:10052) 10H05 Pintz, János On the sign changes of $M(x)=\sum \sb{n\leq x}\mu (n)$$M(x)=\sum \sb{n\leq x}\mu (n)$. Analysis 1 (1981), no. 3, 191–195. Article

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