@article{10_4064_aa_7_4_337_343,
     author = {Stanis{\l}aw Knapowski},
     title = {Mean-value estimations for the {M\"obius} function {II}},
     journal = {Acta Arithmetica},
     pages = {337--343},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1961},
     doi = {10.4064/aa-7-4-337-343},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-7-4-337-343/}
}