@misc{10_1017_S2040618500034328,
     title = {Arithmetical {Functions} of a {Greatest} {Common} {Divisor,} {III.} {Ces\`aro's} {Divisor} {Problem}},
     journal = {Glasgow mathematical journal},
     pages = {67--75},
     year = {1961},
     volume = {5},
     number = {2},
     doi = {10.1017/S2040618500034328},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500034328/}
}