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020 _a61675
082 _a537.56
_bZHI
_223
100 _aZHIGAREV, A.
245 _aElectron optics and electron-bem devices /
_c[by] A.Zhigarev
260 _aMoscow
_bMIR pub.
_c1972
300 _a562 p.
942 _cS