@article{10_4064_aa_26_4_427_433,
     author = {C. Stewart},
     title = {The greatest prime factor of $a^n - b^n$},
     journal = {Acta Arithmetica},
     pages = {427--433},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1974},
     doi = {10.4064/aa-26-4-427-433},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-26-4-427-433/}
}