@article{GDZPPN002357372, title = {Squares in arithmetical progressions I.}, journal = {Mathematica Scandinavica}, volume = {53}, year = {1983}, pages = {5-19}, zbl = {0511.10014}, url = {http://dml.mathdoc.fr/item/GDZPPN002357372} }
Cohn, J.H.E. Squares in arithmetical progressions I.. Mathematica Scandinavica, Tome 53 (1983) pp. 5-19. http://gdmltest.u-ga.fr/item/GDZPPN002357372/