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Beetlestone

Thurmer

: Some considerations of focal spot sizes. Brit. J. Radiol. 81 (1958), 492.

Beese

N. C.

: The focussing of electrons in an X-ray tube. Rev. Sci. Instr. 8 (1937), 258.

Classen

: Röntgenröhren, Ermittlung der Brennfleckgrösse. Fortschr. Röntgenstr. 88 (1959), 747.

Fenner

: Lochkamera-Aufnahmen der Brennflecke von Röntgenröhren. Elektronik 5 (1956), 257.

Frantzell

: Effect of focal size, shape and ‘structure’ on the roentgenographic representation of small-calibre metal objects. Acta radiol. 35 (1951), 265.

Kemp

F. H.

Nichols

A. F.

: Focal spot sizes. Brit. J. Radiol. 31 (1958), 486.

Kuntke

A. H. G.

: On the determination of roentgen tube focal spot sizes by pinhole camera roentgenography. Acta radiol. 57 (1957), 55.

Robertson

C. W.

Watson

: Precise measurements of focal areas in diagnostic X-ray tubes and their applications in tube developement. Brit. J. Radiol. 31 (1958), 489.

Spiegler

Ollenshaw

Macey

: High contrast: A potential source of radiographic error. Brit. J. Radiol. 30 (1957), 481.

10.

Thorp

J. S.

: Electron focussing in a demontable X-ray tube. J. Sci. Instr. 26 (1959), 201.