@article{10_4064_aa_89_4_397_402,
     author = {Ronald Evans},
     title = {Nonexistence of twentieth power residue difference sets},
     journal = {Acta Arithmetica},
     pages = {397--402},
     publisher = {mathdoc},
     volume = {89},
     number = {4},
     year = {1999},
     doi = {10.4064/aa-89-4-397-402},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-89-4-397-402/}
}