@article{ELMA_1969__24_140912,
     author = {D. Suryanarayana},
     title = {Super {Perfect} {Numbers.}},
     journal = {Elemente der Mathematik},
     pages = {16--17},
     publisher = {mathdoc},
     volume = {24},
     year = {1969},
     zbl = {0165.36001},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140912/}
}