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13. Effects of niobium filtration and constant potential on the attenuation of dental X-ray beams by water. McDonnell D, Price C. Dentomaxillofac Radiol; 1991 May; 20(2):77-80. PubMed ID: 1936421 [Abstract] [Full Text] [Related]
16. Evaluation of the use of a niobium filter for patient dose reduction in chest radiography. Thierens H, Kunnen M, Van der Plaetsen A, Segaert O. Br J Radiol; 1991 Apr; 64(760):334-40. PubMed ID: 2025775 [Abstract] [Full Text] [Related]
17. Effects of niobium filtration and constant potential on image quality in dental radiography. 1: Subjective assessment and contrast. McDonnell D, Price C. Dentomaxillofac Radiol; 1991 Nov; 20(4):219-23. PubMed ID: 1808011 [Abstract] [Full Text] [Related]