Entry "looking glass" in the online Cambridge Dictionary. Accessed on 4 May 2020.
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M. A. Kallistratova (1997). «Physical grounds for acoustic remote sensing of the atmospheric boundary layer». Acoustic Remote Sensing Applications. Lecture Notes in Earth Sciences 69. Springer. pp. 3-34. Bibcode:1997LNES...69....3K. ISBN978-3-540-61612-2. doi:10.1007/BFb0009558.
M. A. Kallistratova (1997). «Physical grounds for acoustic remote sensing of the atmospheric boundary layer». Acoustic Remote Sensing Applications. Lecture Notes in Earth Sciences 69. Springer. pp. 3-34. Bibcode:1997LNES...69....3K. ISBN978-3-540-61612-2. doi:10.1007/BFb0009558.
