@article{MAN_1977__226_162952,
     author = {Carl Pomerance},
     title = {Multiple {Perfect} {Numbers,} {Mersenne} {Primes,} and {Effective} {Computability.}},
     journal = {Mathematische Annalen},
     pages = {195--206},
     publisher = {mathdoc},
     volume = {226},
     year = {1977},
     zbl = {0324.10001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__226_162952/}
}