@article{10_1017_S0017089500003128,
     author = {Scourfield, E. J.},
     title = {On the divisibility of r2(n)},
     journal = {Glasgow mathematical journal},
     pages = {109--111},
     year = {1977},
     volume = {18},
     number = {1},
     doi = {10.1017/S0017089500003128},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003128/}
}