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The online version of the original article can be found athttp://dx.doi.org/10.1007/BF02570896
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Mahé, L. Level and Pythagoras number of some geometric rings. Math Z 209, 481–483 (1992). https://doi.org/10.1007/BF02570847
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DOI: https://doi.org/10.1007/BF02570847