@article{EXMA_1996__5_2_226924,
     author = {Cohen, Graeme L. and te Riele, Herman J.J.},
     title = {Iterating the sum-of-divisors function.},
     journal = {Experimental mathematics},
     pages = {91--100},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1996},
     zbl = {0866.11003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_1996__5_2_226924/}
}