A~characteristic property of a~disc
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Geometry of positive quadratic forms, Tome 152 (1980), pp. 124-137.

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     author = {M. D. Kovalev},
     title = {A~characteristic property of a~disc},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {124--137},
     publisher = {mathdoc},
     volume = {152},
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     url = {http://geodesic.mathdoc.fr/item/TM_1980_152_a6/}
}
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M. D. Kovalev. A~characteristic property of a~disc. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Geometry of positive quadratic forms, Tome 152 (1980), pp. 124-137. http://geodesic.mathdoc.fr/item/TM_1980_152_a6/