@article{10_4064_aa103_3_4,
     author = {Henri Virtanen},
     title = {The mean fourth power of real character sums},
     journal = {Acta Arithmetica},
     pages = {249--257},
     publisher = {mathdoc},
     volume = {103},
     number = {3},
     year = {2002},
     doi = {10.4064/aa103-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa103-3-4/}
}