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15. Subtraction radiography: techniques and limitations. Ort MG; Gregg EC; Kaufman B Radiology; 1977 Jul; 124(1):65-72. PubMed ID: 325600 [TBL] [Abstract][Full Text] [Related]
16. A survey of digital chest radiography. Johnson GA; Ravin CE Radiol Clin North Am; 1983 Dec; 21(4):655-64. PubMed ID: 6361846 [TBL] [Abstract][Full Text] [Related]