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@article{MS2_1983__52_166827, author = {J.H.E. Cohn}, title = {Squares in arithmetical progressions {II.}}, journal = {Mathematica Scandinavica}, pages = {20--23}, publisher = {mathdoc}, volume = {52}, year = {1983}, zbl = {0511.10014}, url = {http://geodesic.mathdoc.fr/item/MS2_1983__52_166827/} }
J.H.E. Cohn. Squares in arithmetical progressions II.. Mathematica Scandinavica, Tome 52 (1983), pp. 20-23. http://geodesic.mathdoc.fr/item/MS2_1983__52_166827/