@article{10_4064_aa_28_1_1_21,
     author = {Emil Grosswald},
     title = {Arithmetical functions with periodic zeros},
     journal = {Acta Arithmetica},
     pages = {1--21},
     year = {1975},
     volume = {28},
     number = {1},
     doi = {10.4064/aa-28-1-1-21},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-28-1-1-21/}
}