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@article{MS2_1983__52_166826, author = {J.H.E. Cohn}, title = {Squares in arithmetical progressions {I.}}, journal = {Mathematica Scandinavica}, pages = {5--19}, publisher = {mathdoc}, volume = {52}, year = {1983}, zbl = {0511.10014}, url = {http://geodesic.mathdoc.fr/item/MS2_1983__52_166826/} }
J.H.E. Cohn. Squares in arithmetical progressions I.. Mathematica Scandinavica, Tome 52 (1983), pp. 5-19. http://geodesic.mathdoc.fr/item/MS2_1983__52_166826/