@article{PIM_1998_N_S_64_78_a2,
     author = {Jean-Marie De Koninck and Aleksandar Ivi\'c},
     title = {On a sum of {Divisors} {Problem}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {9 },
     publisher = {mathdoc},
     volume = {_N_S_64},
     number = {78},
     year = {1998},
     zbl = {0993.11048},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1998_N_S_64_78_a2/}
}