1. Uber Sequenzen un Poternzresten;Brauer;S.-B. Deutsch. Akad. Wiss. Berlin,1928
2. Bounds for pairs of consecutive seventh and higher power residues;Brillhart;Math. Comp.,1964
3. Bounds for pairs of cubic residues;Dunton,1965
4. On runs of residues;Lehmer,1962