@article{MV_1965_17_3_a10,
     author = {W. Sierpi and n and ski},
     title = {Sur les nombres pseudoparfaits},
     journal = {Matemati\v{c}ki vesnik},
     pages = {212 },
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1965},
     url = {http://geodesic.mathdoc.fr/item/MV_1965_17_3_a10/}
}