title: A preliminary report: Niobium filter for dental X-ray systems.
authors.forename: J C
authors.initials: JC
authors.lastname: Pettigrew
authors.forename: W K
authors.initials: WK
authors.lastname: Collett
mesh_terms: D005374:Filtration / Q000295:instrumentation*; D009556:Niobium; D011861:Radiography, Dental / Q000295:instrumentation*
chemical_list: D009556:Niobium