@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/}
}