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@article{Perkal’skis:1963,
author = {B. Sh. Perkal’skis},
title = {A simple demonstration of the addition of harmonic oscillations},
publisher = {Physics-Uspekhi},
year = {1963},
journal = {Phys. Usp.},
volume = {6},
number = {2},
pages = {325-325},
url = {https://ufn.ru/en/articles/1963/2/i/},
doi = {10.1070/PU1963v006n02ABEH003513}
}
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