@article{10_4064_aa_12_3_223_228,
     author = {Indar Luthar},
     title = {A generalization of a theorem of {Landau}},
     journal = {Acta Arithmetica},
     pages = {223--228},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1966},
     doi = {10.4064/aa-12-3-223-228},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-12-3-223-228/}
}