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@article{MS2_1979__45_166673, author = {W.J. Ryan}, title = {Proof of the quadratic reciprocity law in primitive recursive arithmetic.}, journal = {Mathematica Scandinavica}, pages = {177--197}, publisher = {mathdoc}, volume = {45}, year = {1979}, zbl = {0433.03024}, url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166673/} }
W.J. Ryan. Proof of the quadratic reciprocity law in primitive recursive arithmetic.. Mathematica Scandinavica, Tome 45 (1979), pp. 177-197. http://geodesic.mathdoc.fr/item/MS2_1979__45_166673/