@article{10_4064_aa_13_1_1_7,
     author = {M. Kalecki},
     title = {A simple elementary proof of $M(x)=\sum_{n\ensuremath{\leq}x} \ensuremath{\mu}(n)=o(x)$},
     journal = {Acta Arithmetica},
     pages = {1--7},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1967},
     doi = {10.4064/aa-13-1-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-13-1-1-7/}
}