@article{10_4064_aa155_1_4,
     author = {Andr\'as S\'ark\"ozy},
     title = {On additive decompositions of the set
 of quadratic residues modulo $p$},
     journal = {Acta Arithmetica},
     pages = {41--51},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {2012},
     doi = {10.4064/aa155-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa155-1-4/}
}