@article{10_4064_aa100_1_6,
     author = {Eduard Wirsing and Don Zagier},
     title = {Multiplicative functions with difference tending to zero},
     journal = {Acta Arithmetica},
     pages = {75--78},
     publisher = {mathdoc},
     volume = {100},
     number = {1},
     year = {2001},
     doi = {10.4064/aa100-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa100-1-6/}
}