@article{10_4064_aa129_2_5,
     author = {Florian Luca and Francesco Pappalardi},
     title = {Composite positive integers with an average prime factor},
     journal = {Acta Arithmetica},
     pages = {197--201},
     publisher = {mathdoc},
     volume = {129},
     number = {2},
     year = {2007},
     doi = {10.4064/aa129-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa129-2-5/}
}