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@article{MZ_1993__214_1_174551, author = {M.S. Ravi}, title = {An effective version of {Nor's} theorem.}, journal = {Mathematische Zeitschrift}, pages = {1--8}, publisher = {mathdoc}, volume = {214}, number = {1}, year = {1993}, url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174551/} }
M.S. Ravi. An effective version of Nor's theorem.. Mathematische Zeitschrift, Tome 214 (1993) no. 1, pp. 1-8. http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174551/