Geodesic
On P.A. Shirokov's Curve and Theorems of Hausdorff and Dines
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 151 (2009) no. 4, pp. 51-53

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We discuss relations between geometric results obtained by P. A. Shirokov in 1930-s and classical theorems of F. Hausdorff and L. Dines.
Keywords: quadratic form, numerical range, boundary curve. 
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     title = {On {P.A.~Shirokov's} {Curve} and {Theorems} of {Hausdorff} and {Dines}},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
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M. Yu. Kokurin. On P.A. Shirokov's Curve and Theorems of Hausdorff and Dines. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 151 (2009) no. 4, pp. 51-53. http://geodesic.mathdoc.fr/item/UZKU_2009_151_4_a4/