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4. [Are additional filters made of niobium superior to the copper filter in dental radiology?]. Cordt I, Engelke W. Schweiz Monatsschr Zahnmed; 1990; 100(10):1160-3. PubMed ID: 2237349 [Abstract] [Full Text] [Related]
16. Niobium filter v. an aluminum filter. Stirling GC, Holloway AF. Ont Dent; 1990 Oct; 67(8):25-7, 29-30. PubMed ID: 2280962 [No Abstract] [Full Text] [Related]
17. Diagnostic image quality and dose reduction using niobium filtration for cephalometric radiography. Wakoh M, Farman AG, Kelly MS, Kuroyanagi K. Dentomaxillofac Radiol; 1993 Nov; 22(4):189-94. PubMed ID: 8181645 [Abstract] [Full Text] [Related]
18. [Dose and exposure reduction in endodontic radiology through the use of new filters]. Gigola P, Marcoli PA, Cordone L. G Ital Endod; 1990 Nov; 4(4):26-8. PubMed ID: 2133816 [Abstract] [Full Text] [Related]