SPANGENBERG, H D Production of clinical roentgenograms by means of compact radioactive x-ray and gamma-ray sources; an experimental study. [electronic resource] - Journal of dental research - 920-9 p. digital Publication Type: Journal Article ISSN: 0022-0345 Standard No.: 10.1177/00220345580370052201 doi Subjects--Topical Terms: Gamma RaysIsotopesX-Ray FilmX-Rays