@article{10_4064_aa155_4_1,
     author = {Helge Tverberg},
     title = {On some number-theoretic sums introduced by {Jacobsthal}},
     journal = {Acta Arithmetica},
     pages = {349--351},
     publisher = {mathdoc},
     volume = {155},
     number = {4},
     year = {2012},
     doi = {10.4064/aa155-4-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa155-4-1/}
}