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MR 0105028
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MR 1532372 |
Zbl 0127.28003
[3] Mond B.:
A matrix version of Kantorovich’s inequality. PAMS 16, 1131, 1965.
MR 0180561
[4] Pták V.: Moderní analysa I. SPN Praha 1974, pp. 165-172.