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@article{PORMA_1981__40_3_115454, author = {Vegh, Emanuel}, title = {$\lambda $-primitive roots}, journal = {Portugaliae mathematica}, pages = {297--303}, publisher = {mathdoc}, volume = {40}, number = {3}, year = {1981}, mrnumber = {0819894}, zbl = {0577.10005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115454/} }
Vegh, Emanuel. $\lambda $-primitive roots. Portugaliae mathematica, Tome 40 (1981) no. 3, pp. 297-303. http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115454/