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@article{MS2_1963__13_165849, author = {Solomon Leader}, title = {On a {Problem} of {Alfsen} and {Fenstad.}}, journal = {Mathematica Scandinavica}, pages = {44--46}, publisher = {mathdoc}, volume = {13}, year = {1963}, zbl = {0129.37605}, url = {http://geodesic.mathdoc.fr/item/MS2_1963__13_165849/} }
Solomon Leader. On a Problem of Alfsen and Fenstad.. Mathematica Scandinavica, Tome 13 (1963), pp. 44-46. http://geodesic.mathdoc.fr/item/MS2_1963__13_165849/