@article{JRAM_1893__112_148907,
     author = {J.C. Fields},
     title = {The numbers of sums of quadratic residues and of non-residues respectively taken n at a time and congruent to any given integer to an odd prime modulus p.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {247--261},
     publisher = {mathdoc},
     volume = {112},
     year = {1893},
     zbl = {25.0282.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1893__112_148907/}
}