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@article{MS2_1976__39_166498, author = {A.F. Horadam and A.G. Shannon}, title = {Ward's {Staut-Clausen} problem.}, journal = {Mathematica Scandinavica}, pages = {239--250}, publisher = {mathdoc}, volume = {39}, year = {1976}, zbl = {0347.10010}, url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166498/} }
A.F. Horadam; A.G. Shannon. Ward's Staut-Clausen problem.. Mathematica Scandinavica, Tome 39 (1976), pp. 239-250. http://geodesic.mathdoc.fr/item/MS2_1976__39_166498/