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@article{PORMA_1957__16_1_114780, author = {Carlitz, L.}, title = {The singular series for a single square}, journal = {Portugaliae mathematica}, pages = {7--10}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1957}, mrnumber = {0097368}, zbl = {0080.03403}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114780/} }
Carlitz, L. The singular series for a single square. Portugaliae mathematica, Tome 16 (1957) no. 1, pp. 7-10. http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114780/