@article{BUMI_1962_3_17_4_a0,
     author = {Cohen, Eckford},
     title = {Arithmetical functions of a greatest common divisor. {II.} {An} alternative  approach.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {349--356},
     publisher = {mathdoc},
     volume = {Ser. 3, 17},
     number = {4},
     year = {1962},
     zbl = {0109.27402},
     mrnumber = {150093},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1962_3_17_4_a0/}
}