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2.
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4.
HolmesE. M. Boston: “The Examination and Treatment of the Nasopharynx and the Eustachian Tube by the Aid of the Pharyngoscope.”Ann. Otol., Rhinol. and Laryngol., 1911, Vol. 20, p. 19.
5.
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CoffinL. A.: “Negative Pressure as a Therapeutic Measure in the Treatment of Sinus Disease.”Laryngoscope, Vol. xxviii, Jan.-Dec., 1918, p. 882 (Disc.)
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HornHenry: “Uber Saugbehandlung bei Erkrankungen der Nebenhohlen der Nase.”Zeitschrift f. Ohrenheilk., 1, 57, p. 23.
8.
HolmesE. M. Boston: “Rhinoscopy.”Ann. Otol., Rhinol. & Laryngol., 27, 1918, p. 179.
9.
WalbBonn: “Ueber Saugbehandlung der Nase.”Dtsch. Med. Wchnsch., No. 1, 1909, p. 22.
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12.
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