@article{MASLO_2003_53_5_a1,
     author = {Luca, Florian},
     title = {On the sum of divisors of the {Mersenne} numbers},
     journal = {Mathematica slovaca},
     pages = {457--466},
     year = {2003},
     volume = {53},
     number = {5},
     mrnumber = {2038513},
     zbl = {1061.11005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2003_53_5_a1/}
}