Hagstrum, J. T. (2000). ‘Infrasound and the avian navigational map’, Journal of Experimental Biology, 203 (7). P. 1103–1111.
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См.: Grant, U. S. (1895), Personal Memoirs of U. S. Grant. Sampson Low, ch. 28. Другие примеры: www.nellaware.com/blog/acoustic-shadow-in-the-civil-war.html.
