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3. “Value of Mechanical Aids to Breathing; Case Report of Poliomyelitis,”;Beck;Ann. Int. Med.,1954
4. “Exsufflation in Post-Operative States,”;Williams;Am. J. Surg.,1955
5. “Exsufflation with Negative Pressure (E.W.N.P.),”;Bickerman;Arch. Int. Med.,1954