@article{10_1017_S0017089500001075,
     author = {Anderson, Ian},
     title = {A concavity problem in number theory},
     journal = {Glasgow mathematical journal},
     pages = {10--11},
     year = {1971},
     volume = {12},
     number = {1},
     doi = {10.1017/S0017089500001075},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001075/}
}