Stephen D. Cohen, Tomás Oliveira e Silva, Timothy Trudgian. A proof of the conjecture of Cohen and Mullen on sums of primitive roots. Math. Comput., 84(296):2979-2986, 2015. [doi]
@article{CohenST15,
title = {A proof of the conjecture of Cohen and Mullen on sums of primitive roots},
author = {Stephen D. Cohen and Tomás Oliveira e Silva and Timothy Trudgian},
year = {2015},
doi = {10.1090/mcom/2950},
url = {http://dx.doi.org/10.1090/mcom/2950},
researchr = {https://researchr.org/publication/CohenST15},
cites = {0},
citedby = {0},
journal = {Math. Comput.},
volume = {84},
number = {296},
pages = {2979-2986},
}