@article{10_4064_aa125_4_3,
     author = {Wenguang Zhai},
     title = {On the mean value of the index of composition of
 an integer},
     journal = {Acta Arithmetica},
     pages = {331--345},
     publisher = {mathdoc},
     volume = {125},
     number = {4},
     year = {2006},
     doi = {10.4064/aa125-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa125-4-3/}
}