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@article{Perkal’skis:1973,
author = {B. Sh. Perkal’skis and V. L. Larin and M. F. Konosheidov},
title = {Lens for sound waves in air},
publisher = {Physics-Uspekhi},
year = {1973},
journal = {Phys. Usp.},
volume = {15},
number = {4},
pages = {513-514},
url = {https://ufn.ru/en/articles/1973/4/k/},
doi = {10.1070/PU1973v015n04ABEH005000}
}
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