@article{10_4064_aa_7_1_29_38,
     author = {E. Cohen},
     title = {Unitary products of arithmetical functions},
     journal = {Acta Arithmetica},
     pages = {29--38},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1961},
     doi = {10.4064/aa-7-1-29-38},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-7-1-29-38/}
}