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Published in Russian in Matematicheskie Zametki, 2009, Vol. 85, No. 5, pp. 797–800.
The text was submitted by the authors in English.
An erratum to this article can be found at http://dx.doi.org/10.1134/S0001434609110352
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Wei, X., Lan, W. & Ding, R. About convex 4-isosceles 7-point sets. Math Notes 85, 760–763 (2009). https://doi.org/10.1134/S0001434609050186
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DOI: https://doi.org/10.1134/S0001434609050186