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@article{MS2_1974__35_166394, author = {Kenneth S. Williams}, title = {3 as a {Ninth} {Power} (mod p).}, journal = {Mathematica Scandinavica}, pages = {309--317}, publisher = {mathdoc}, volume = {35}, year = {1974}, zbl = {0297.10002}, url = {http://geodesic.mathdoc.fr/item/MS2_1974__35_166394/} }
Kenneth S. Williams. 3 as a Ninth Power (mod p).. Mathematica Scandinavica, Tome 35 (1974), pp. 309-317. http://geodesic.mathdoc.fr/item/MS2_1974__35_166394/