1. Entsiklopediya klinicheskogo obsledovaniya (Encyclopedia of Clinical Investigation), Moscow: Geotar Meditsina, 1997.
2. McKusik, V.A., Jenkins, J., and Webb, G.N., The acoustic basis of the chest examination: studies by means of sound spectrography, Amer. Rev. Tuberc., 1955, vol. 72, no. 1, p. 12.
3. D’yachenko, A.I. and Mikhailovskaya, A.N., Respiratory acoustics, Tr. Inst. Obshch. Fiz., Ross. Akad. Nauk, 2012, vol. 68, p. 136.
4. Korenbaum, V.I., Tagil’tsev, A.A., D’yachenko, A.I., and Kostiv, A.E., Comparison of the characteristics of different types of acoustic sensors when recording respiratory noises on the surface of the human chest, Acoust. Phys., 2013, vol. 59, no. 4, p. 474.
5. Zamotaev, I.P., Magazannik, H.A., Vodolazskii, L.A., et al., Spectral analysis of the most important auscultatory signs, Klin. Med., 1974, vol. 52, no. 5, p. 97.