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@article{MS2_1991__68_1_167142, author = {David Sanker}, title = {The converse to {Alexandre} {Froda's} irrationality criterion.}, journal = {Mathematica Scandinavica}, pages = {5--18}, publisher = {mathdoc}, volume = {68}, number = {1}, year = {1991}, zbl = {0731.11042}, url = {http://geodesic.mathdoc.fr/item/MS2_1991__68_1_167142/} }
David Sanker. The converse to Alexandre Froda's irrationality criterion.. Mathematica Scandinavica, Tome 68 (1991) no. 1, pp. 5-18. http://geodesic.mathdoc.fr/item/MS2_1991__68_1_167142/